I think Miss Fluffy means that in cases like this, they virtually HAVE to be slaves to their passions or they wouldn't react so "passionately" to a break-up, etc.
You only see crazy, reckless, violent, despairing and other passionate behavior among those who haven't learned to moderate their passions and desires. Those who put few (if any) restraints on their passions tend to not be virgins, shall we say.
Not that every violator of the sixth/ninth commandment is violent, despairing, out of control, etc. -- but the other way around IS usually true.
When you are in a chaste relationship, no matter what happens (break-up, etc.) you are never tempted to get a gun and kill people, kill oneself, beat someone up, have a fight, etc. Usually it's only when a couple has "become one" and then gets ripped apart for whatever reason.
It's sort-of natural (or at least expected) that this should happen, because the original behavior is not according to God's plan. God designed marriage to be permanent, and to help avoid problems like the one in the article above.
In Christ,
Matthew