You should go. Immediately.
First of all, why are you dating a man who is living with his ex? And are they still married? Or were they never married?
Second of all, if the reason you are living with him and his ex is because you can’t afford to live on your own, then you need to make your living situation a priority — especially if you have children of your own. 😕 Going to graduate school is great, but not at the expense of your housing for you and your kids. Grad school is something you should put on the back burner for now so you can make enough money to find proper housing for you and your kids.
Once you move out, my advice is to not date your boyfriend until he is no longer living with his ex-girlfriend (wife?), mother of his children. Clearly, he’s put her ahead of you, and this isn’t the behavior of someone you should be dating. If he continues to do this after you’ve moved out and after he’s living on his own without her, then it’s time to move on. 😉
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