What should I do?

So... I'm in a 5 year relationship with my boyfriend, we're both 21 and we love each other a lot. The thing is that one of those insecurity/curiosity moments, I decided to check out his phone for a moment.. I know it is not correct since i'm invading his privacy and i'm ashamed bc I already did that once before and never did again until now and I feel so guilty. So, when I was checking I noticed that he had X (Twitter), i was surprised because I didn't know he had X, so I was curious on what his user was and see his profile.. but when I opened the app, his feed was full of sexy girls, I mean, with their curvy bodies, sexy costumes, almost nudes, etc. I started shaking bc he's following 140 at the moment, and this acc is 1 year old. I started to feel even more insecure about my body, I can't stop thinking about it.. I don't wanna talk about it with him but I also want to, I just don't want to admit that I checked on his phone again and found that because I think this is very private. I also have to admit that I had that -curious era- about seeing female bodies specially doing cosplay or something, and I think he is going through this era too... I don't know what to do about it... I don't even know what to say here... This is making my head stormy