Troubled Times

I'm in a 5 year relationship with a guy who's a bit of a narcissist and has anger problems. Through the course of our relationship he has cheated on me multiple times, and it has changed me from the trusting, caring person that I was to a bitter, resentful, paranoid person. I have anxiety and depression and he hasn't helped those things at all. He has recently changed his ways and is getting better, however I'm to the point where I'm over it. I'm done feeling like I take a back seat to everything in his life. I want to find a way out but the problem there is we work together, live together, and have everything together. I feel stuck. I don't know what to do. I don't feel like I can talk to family or friends because they already don't like him. I keep my emotions to myself. I feel alone. I never have time to myself either. If anyone has advice I would really appreciate it. Thanks.