I'm so angry but I can't show it! I just went to lay down with my boyfriend since I have just…

I'm so angry but I can't show it! I just went to lay down with my boyfriend since I have just finished my homework he is already sleeping and then his phone starts to vibrate so I look since I can. I see it's a weird app message him! He goes to a nursing school with all girls and this app has a group messaging and I read the messages and nothing bad was there but then I go to his profile and instead of putting a picture of us or his upcoming daughter he puts a sole picture of him he has not posted anywhere that he's having a kid and it's really starting to bother! I am 31 weeks pregnant now and I can't show it cause I told him I wouldn't look through his phone now I don't know what do to do I feel like he's a shame of his daughter like why doesn't he want people to know I put a picture of her everywhere I can