Feeling stupid

I posted about this before but I just completely feel dumb. My BF is constantly choosing his friends over me and our son. Wtf do I do I talked about it with him and here he is again lying to us about when he'll be home cause it seems like he'd rather be having beers with his friends..... Forgot to mention I'm 32 weeks pregnant and feeling like I'm doing everything on my own! Does anyone have advice? He's not a horrible bf or dad either... This is just something we can't seem to get over... He'll say he'll be back in 20 mins and won't be back for HOURS.. am I over reacting? I'd be fine with him hanging with his friends if he would just be honest with me and not stay out so late.... He says I'm crazy and ruining his friendships but I'm tired of feeling so fucking alone if that makes since?