What would you do???? S/O inbox

I was using my boyfriends laptop (with his permission) his facebook was up so i went through his messages..a little back story..some months ago i had been having a gut feeling that he had been talking to other girls via messenger/txt..it was a big deal in our relationship it almost broke us up because of my insecurities..well recently ive been trying to deal with it and i guess internalize it..well when i looked, this is what i found..2 of the girls dont live in our area..one seems to be an ex..not sure what to do..but now i feel like i had a reason to feel the way i waa feeling..I TRIED MAKING THE WORDS A BIT MORE VISABLE..THESE ARE NOT THE WHOLE CONVERSATIONS..JUST THE PARTS I THOUGHT WERE DISRESPECTFUL..

UPDATE: he is out of town right now but i spoke to him and he said it was done on purpose because if we got into another argument about his phone and facebook (i always have a feeling he is talking to somebody so i ask to see his phone and he always says no) he was going to give me the phone so i could see the conversations and decide to leave (he says im always looking for something)

UPDATE 2:well we are no longer together..i found out he had been txting ANOTHER girl on his phone (in his hometown..out of state)..i brought it up to him and he ended it..i talked to her and she said its nothing..but the txt all the time and he calls her first thing in the morning on his way to work..its hard beacuse i have 3 kids (who arent his) that have gotten attached to him..i have nowhere to go until i get some money next week..i know i deserve better but i still love him..this is going to be hard..thanks ladies for your insight..