Please help!

I am 35 weeks and an emotional wreak. I don’t know if it’s because I am 35 weeks or because my partner is being secretive on his phone and from what I have seen looks like he is getting “pleasure” from other girls via social media and attempting to delete the evidence. Not only does it feel like shit because it feels like cheating but it also makes me feel like I’m not good enough because my body has changed and maybe he isn’t attracted to me anymore. It has been going on for a while so when ever he wants to be intimate I say yes, I’m the hope he won’t need to go else where but he still does. Someone please help me I have no idea what to do and I’m sick of feeling this way. 💔