Not sure what to do anymore.

I’m 18 weeks pregnant and my boyfriend won’t stop talking to other girls. I know how it sounds. Just leave him and stuff like that but if I do leave him I wouldn’t keep my baby and I would love to keep him. I know it sounds selfish and stupid but when we first found out i told him that if we are gonna go through with this pregnancy that he would have to clean his act up and if he didn’t then I won’t raise this child in a broken home. We both came from broken homes. His parents divorced when he was young and my parents are just recently divorced but they haven’t gotten along in years. I always told myself if I was going to have a baby I wouldn’t put it through what I went through with my parents. This is the third time I’ve caught him texting other girls and on dating sites. Each time he promises to be better and swears that he loves me and he’ll change,but he never does. I’m tired of feeling not good enough. I do everything I can for him. Everything. And it still just doesn’t seem like enough. I love him but I love my baby more and I want him to have everything. And I know I can’t do that by myself. I just don’t know what to do at this point..