I was hanging out with my boyfriend yesterday and I took his phone and jokingly asked if I could go through it. Then he said sure and clicked on messages and started scrolling. Then I saw a convo with a girl called "Tinder Francesca" so I asked him to explain because the convo was dated during the time we've been going out. He said that they met on Tinder before he and I started dating, and that the girl now has a boyfriend too and that it wasn't anything. I skimmed the messages and it was just small talk and no flirting and I trust him in the fact that I don't believe he would cheat on me (because he's been cheated on before) and other than that he's been an amazing boyfriend. Obviously he's still capable of cheating on me but its highly unlikely, but I didn't know how to react to this situation... opinions?
He seems to have nothing to hide, and hasn't attempted to hide anything. You have read the messages, do you think a cheating man would allow you to do that? I don't. I think everything is as he says it is.
Move on. You already saw the messages anyway. There's not really another way to react to it. You can't get upset because like you said yourself, he wasn't flirting. Small talks. Besides, he dated her before you anyways.