Pretty sure bf is not over ex

So my bf and I have known each other a very long time, even dated when we were teens for a bit. Throughout the years he had two long term relationships about 5 years each. The last one ended badly about two years ago and as friends we talked quite a bit about it.

He tried getting ahold of her for months afterwards, almost a year. He still keeps naked photos of her in his phone under favorites. He since moved out of state to be by me for the past year and we are currently almost 10 weeks pregnant. He made a Facebook the past weekend to keep in touch with family. The first people he added, even before some of our oldest and closest mutual friends, are his ex’s good girlfriends. I just think it’s odd and I still don’t think he’s over her.

Edit: thank you all for your feedback. I have been distancing myself from him and it’s hard but I know it’s best for me and baby. I haven’t seen him for almost a week. Aside from the odd behavior regarding his ex he has a drinking problem that is getting worse. He was in treatment until I got pregnant. Since then, our relationship has gotten much worse with drunk angry calls and such. He’s been my best friend for a long time and I’ve known him since we were kids. It saddens me how this has developed because he was NEVER like this before. It has gotten progressively worse. He used to be the sweetest person. I just know I can’t deal with this all, especially being high risk due to age.