Bf on Craigslist

So I met my BF on Craigslist 6 years ago. It's been a tough 6 years, he's cheated on me. I was playing around on his tablet and noticing lately he has not been himself so I searched his emails and found these. Granted they're from a while ago but I am DONE!!!! I don't even know how to bring it up. I shouldn't of snooped but I'm glad I did. I'm so heart broken. Some are posted in casual encounters others on personals.