He parties too much

Lately my bf has been going out a lot and he comes home really late 2 -3 in the morning I don't wanna question him and tell him what to do because I don't wanna be like his ex wife but lately he's been reminding me of my ex always gone drinking never home. At this point this is giving me anxiety attacks I can't sleep at nights and I've been really sick this has been one of my worst pregnancies and I expect him to be home more and to be more supportive but things are going bad . He never party before we got pregnant and now is like he tries to stay away from home and from me 😢