Welcome to the board, Bella1015 ~
So you don't think my questions are because I doubt you, let me first say I'm a big believer in your gut.
I wish I didn't sound so crazy.
You don't sound crazy, not at all.
Bella, we had another poster here with the same kind of problem a while back.
Ok. So this morning I had a conversation.
EDIT: I just read your response, which I missed before. I think you need to end this relaitonship. You really don't trust him, you just want to act like you do. He is secretive about their communications and regardless of whether it's because it's an inappropriate friendship to begin with, or because he feels stifled by your jealousy, this is a relationship that should end. Gut feelings are important, and something is telling you that this isn't right.
If you really do have a problem having any female friends, then that would be one thing, but I don't think I would trust this "friendship" either.