I recently found some messages on my partners phone (not proud of it, I had a gut feeling which turned out to be right). They're Snapchat messages and one of them was about them arranging to meet up. No evidence that they actually did. I've confronted my partner about it and he's adamant he didn't but I'm not so sure. He's was also messaging 4 other girls on Snapchat, one of which his ex. Anyway, I've found the girl he was arranging to meet on Facebook.. and her boyfriend. I really want to message her to get some answers. Do you think I should? If so what should I say? Do I message the boyfriend as well to let him know what's been going on? I think if I was in his position I'd appreciate it if someone told me.