<human>: Could you distill the essence of the text into 1-3 sentences?

I love my boyfriend, we have been together little more than two years. At some point we even talked about getting married. However since the beginning of our relationship my boyfriend was an alcoholic. It was really hard to see the person I love just wreck themselves with this substance. We got into a lot of fights because of it & sometimes he would say hurtful things to me if were fighting and he was drunk. There was a time where I almost broke up with him because I couldn't handle the hurtful things he would say. 

Now my boyfriend got the help he needed, he is 2 months sober and has become a happier healthier person. I'm proud of my boyfriend for all of the positive changes he has made in his life. However I feel sometimes that I can't join him in his happiness. I feel like I've been hurt so much while he was drinking that even though he is sober, I still am stuck in the past. I actually started going to a support group hoping I could change my attitude, but I've only been to 2 sessions & progress is slow. 

A few days ago my bf told me he could see I was struggling with something and I broke down. I told him that I was at a crossroads because while he was happier I was stuck reliving the past & that I know if I keep doing this I will have to let him go. However, as selfish as it may be I don't want to leave my bf & thats why I am getting help from the support group. My boyfriends been mad at me and hasn't really talked to me. I feel like an awful person & don't really know what to do. I could use some advice.
<bot>: my bf is two months sober, I can't let go of the past & am trying to get help but don't know if I should stay or leave my bf.