BEYOND PISSED AND UPSET

Okay so I need all of you to please comment your opinion bc this is complete bullshit. So me and my bf were up the road at a friends house and I must have said something that he didn't like, it wasn't a big deal but he makes it like it is, so he left and went home. He messaged me saying he'd be back in 38 mins which idk why 38 he said he just made it up. Okay so and hour and a half goes by and he comes back and he admits he was masturbating, oh well every guy does it. The next day all I do is click on his messages and he left a certain persons messages up and they were his exes Fucking nudes. He never exits out of his apps and his messages were exited out of it but these messages were old so he scrolled down to the bottom just to find them but what he didn't know is you must go back to all messages if he didn't want me knowing. It's obvious That's what he was masturbating too so ugh. HELP