Where do you draw the line in marriage? When do you decide that it is really over?

well i belive that when you deside to get to get married make shure that you turly love the person because that SHOULD be the person that you spend the rest of your life with ... sadley thats not the case thease days..

That depends on the situation. You need to decide what you are willing to do to save the marriage first. Try to think about all the reasons you fell in love in the first place. Instead of focusing on all the negative things you don't like about your partner, think of some of the things you do love. Relationships are hard work...and its not easy when things get rough. Try reading The Five Love Languages by Gary Chapman...it could save your marriage, or at the very least, help you in your next relationship if you decide to go that route.