I found some conversations on my boyfriends facebook?

[SGM]

Sorry. Once a flirt has a girlfriend, he is required to STOP flirting with other girls. The excuse 'he is a flirty guy' just doesn't work once he is in a relationship.

Yes, his behavior is disrespectful. But more importantly, his behavior is DISLOYAL. He has made it clear he still has strong feelings for his ex girlfriend.

Split himself in half if he could? How does that make you feel that he wants to be with his EX GIRLFRIEND exactly the same amount as he wants to be with you?

You don't have to confront him. Just tell him you don't see the relationship going any further and it's time to go your separate ways. Don't give him any reasons! Let him try to figure out what he did wrong. He KNOWS he is behaving badly behind your back. He just never expected to get caught. By leaving him wondering, you get some satisfaction.