Here is an advice I read somewhere:
"Marriage may turn out to be "happy" or "unhappy", it really does not matter because happiness is not our goal in life. To be able to be content while enduring an unhappy marriage is a grace from God.
Persevere in prayer, work at doing what is right regardless of your spouse. God will hold you responsible for your own behavior, and your spouse will be held responsible for her/his own actions. Our joy in life comes from following God's will, not in being happily married, or financially well off, or anything else".