I fully agree with Rose. I just want to add that you are an adult now, and your mom is going to have to come to terms with that. Soon you will finish college, get married and have children of your own. Your mom needs to learn how to let go and let you be your own person. I think moving in with him, may be premature unless you have a plan if things don't work out. If you have a job and can afford your own place then it is less of a risk. If you get in a big fight with your mom, move out and stay with him without any means of your own, then you may be trapped. My wife did this when she was around 18 and she ended up with an abusive asshole and didn't have anywhere else to go. I'm not saying your bf is like that, but I wouldn't burn bridges with your mom if you don't have to. I would try to talk to her. It sounds like she is pretty irrational but maybe with enough talking it will sink in that this guy isn't like her ex, you care about him and he treats you well. I hope things work out for you.