Quote:
Leave it. There's plenty of other girls. You fell into recovery by getting sexual. She initially liked it because she was thinking emotionally and was turned on. Once she came to her senses, she was filled with buyers remorse. Conversations on Facebook are dangerous too. Good chance the boyfriend will look at the message thread at some point. I would keep things professional and agree with her that you guys should not have done that. Agreeing with her saying you shouldn't do it again is also the most likely way to move the subject forward anyhow.
Oh quit it. There's no reason for him to leave it.
@OP:
Don't argue with her or try convince her otherwise. Just agree and even amplify whatever she says. If she says "I'm a terrible person" just say "Yeah, the worst kind".
Also treat her as if her boyfriend doesn't exist. He should be none of your concern. Don't even acknowledge his existence.