[SOPi_Jawbreaker]

Then the onus is on him to show that he's changed his ways. If someone really loves you and there is something that is important to you (whether it be sorority, church, family, friends, education, work, volunteer work, etc.), they will respect it even if they don't understand it. If someone truly loves you, they will not belittle something that is important to you and they will not make you choose between him and the something that's important to you. I don't know if you're religious, but if you are, imagine if he were asking you to choose between him and church. Would you put up with his shit then? You deserve someone who is going to treat you right...someone who (like what ASTalumna06 mentioned) is going to build you up not tear you down. If he changes and becomes a positive person in your life, then that's wonderful. But if he continues to be a negative person in your life, you don't need that. You deserve better, and you need to believe in yourself enough to know for yourself that you deserve better.