If a spouse commits adultery would this be a reason to seek an annulment? Or would an annulment not be an option for the other spouse?

An impediment obviously can't be retro-active, although in the Novus Ordo, they don't care.

However, if someone marries someone while carrying on with someone else, that could nullify a marriage.

So you can not permanently leave a person

You can put away an adulterous spouse.

and seek remarriage if they commit adultery?

How does a Catholic not know you can't?

An impediment obviously can't be retro-active, although in the Novus Ordo, they don't care.

However, if someone marries someone while carrying on with someone else, that could nullify a marriage.

Obviously, that nullification would be based on the fact that the
"carrying on" was in progress before the marriage took place.

This is the purpose of the practice of the "Banns of Marriage"
announcements that happen from the pulpit of a church or a
chapel, before everyone present.  There are 3 such announce-
ments made over a period of about 3 months before the
wedding date.  If anyone hears such announcement and has
been witness to one or the other of the betrothed having been
in the company of someone else and having conducted himself
(or, obviously, "herself" /alternatively "themselves" - a word that
needs to be replaced with a new word for this purpose) in a
manner suspicious or unbecoming of one who is about to be
married to another, or, if anyone has heard one of the
betrothed speaking of any such attractions, interests, promises,
dedications or the like, he (or she, of course) is requested to
come forward with the information such that the priest who
oversees this marriage's validity and progress would know what
is going on.  This is to PREVENT the future question of infidelity
arising, that is, infidelity that was IN PROGRESS at the time of
the wedding.

Quote from: InfiniteFaith

So you cannot permanently leave a person and seek remarriage if they commit adultery?

This is a common mistake based on a misinterpretation of
Scripture where Our Lord says except for infidelity, etc.  The
Protestants made a new religion -- a heresy, in fact -- partially
built on the rejection of this Divine Revelation that Our Lord gave
to mankind, which He taught His Church and which the faithful
Church has kept intact all through the ages right up to the brink of
Vat.II, where the unclean spirit swept it away along with so many
other things.  Vat.II was truly an enormous disaster which no
Catholic can countenance.

The infidelity that Our Lord spoke of had to be an infidelity that
had been existing at the time of the marriage, not committed
AFTER the valid marriage was created.  

Few things in this life are truly created, and marriage is one of
them.  The word "create" is highly abused, and really has no place
in common parlance such as "create a corporation" or "create a
computer file" or "create a new thread on the forum."  Properly
spoken you should say "made a corporation" or "made a computer
file" or "made a new thread on the forum," because you are
putting together things that are not YOU, when you make those
things happen.. in marriage you are putting YOURSELF together
with someone else, and together the two of you create a marriage,
with the cooperation of God.  God is always involved in any act of
creation.  How can God always be involved in the making of a
corporation when, for example, its purpose and end is nothing but
evil, such as a pornography distribution corporation, or Planned
Parenthood?  

You cannot leave a person and seek remarriage for any reason if the marriage was valid.

The only way to get out of a valid marriage is death of one of the spouses.

That is, the only way for one spouse to get out of a valid marriage
is the death of THE OTHER spouse.

When you say "get out of one marriage" that inherently implies that
one can then "get into a new marriage."  Only in this temporal world
can on be in one marriage or in a different marriage.  In eternity no
one at all is in any marriage, except for the eternal marriage of God
and creature. In fact, temporal marriage is an analogy of the perfect
and total marriage of God and man in eternity, which will be shared by
all those who are saved, and which is a great mystery for us in this
life, as it is something that we are not capable of imagining.

The spouse who dies in this life is not "getting out" of the marriage.  
The marriage is getting out of the spouse who dies.  Marriage does not
apply to anyone in eternity.  Any man and woman in heaven who were
married in life have no such bond due to their temporal marriage, and
if one of them ends up in hell, the one in heaven does not then grieve
the loss of his (or her) spouse because the perfect joy of eternal
salvation washes away any such attachment or deference to temporal
things, among which is marriage per se.

Likewise, for any spouse to find himself in hell will have nothing but
hatred for his spouse who is in heaven forever, and this hatred is not
only understandable for the fact of the eternal misery endured and the
eternal bliss of the other who is absent, but from the nature of eternal
damnation itself, where every person (devils are persons, too) is
forever hateful of every other person, without limit, and their entire
existence and being is consumed, as it were, with hatred, for that is
all they know.  There is no love in hell, not even for one's self.  Self-
love is what puts a person INTO hell, but it does not keep them there.

In a different way, any man and woman who find themselves in hell
for eternity will have no regard for each other nor relationship based
on their temporal marriage, except for a most intense mutual hatred,
and having more familiarity with the other person due to the marriage,
they will then have all the more to hate about their erstwhile spouse.  
In this way, some marriages can be seen to be a living hell on earth,
unfortunately.  

Evidently, the previous post was the occasion for moving this
thread out of the General Discussion forum and into the Catholic
Living in the Modern World forum.  :)

However, the injured party may apply for a civil divorce if remaining under the same roof is intolerable (e.g. serial infidelity), just not remarry. Correct or incorrect?

Marsha

Strictly speaking, serial infidelity is not necessary to permit the dissolution of common life.  I believe that the reasonable determination that subsisting in the shared household would result in an impediment to charity such that it becomes a persistent occasion to intemperance of word or action, or that the faithful spouse's good name, or dominion of his family would be undermined, civil divorce is permitted.  Of course, remarriage is impossible while the offending spouse lives.

The wife and I were reading Mark 12 the other day where they were asking Jesus if the husband dies and the wife marries again who would be the wifes husband after they rose from the dead to which Jesus said "for when they rise from the dead they neither marry or are given in marriage but are like the angels in heaven."

It's worth remembering that when we rise from the dead we won't be married. Kind of sad if you have a good marriage, I hope I still get to see my earthly wife if we get to heaven. But on the other hand, if marriage isn't so good, it's not an eternal thing so it might be worth enduring, also don't take grudges to the grave with you.