bad relationship?

I have a man we live together almost a year now but I feel like he is doing me wrong everything has changed his attitude and everything towards me. what should I do??

I have a friend that I talk to about everything and now he wants more than a relationship and no I havent cheated he has always been there for me thru everything and he wants to take me from the no good men I end up with! I really like him but I don't want to lose the friendship we already got.

I need opinions good or bad.