How to deal with jealousy between boyfriend and his "friend"
I've been with my boyfriend now for 8 months. While we were seeing each other but before we were officially dating, he agreed to go as a date to a wedding with a girl that he knew from college. I thought it was weird, but I didn't say anything because we were casual and he can do what he wants. Fast forward to the wedding (when we are officially dating, and she knows it), she's posting lots of pictures on Facebook of the two of them with captions that I didn't care for, like how the two of them are the best dates, etc. We have talked about it, and how I'm uncomfortable with the types of things she posts, and how in the future I probably wouldn't like him being some other girl's date to a wedding, and I just let it go. However, she just keeps posting things from this wedding, including one picture where they're dancing together and it almost looks like they're holding hands. He doesn't like any of the things that she posts and, apart from her posting things that "make her think of him" or [URL=https://www.loveforum.net/usertag.php?do=list&action=hash&hash=tbt]#tbt[/URL] to times when they were in college, his Facebook is mostly us, his mom, or his other good (mostly male) friends. I do trust him and I believe him when he says that he has no feelings for her and barely considers her a friend (the wedding date thing was weird, and I could go into more detail if needed), but I don't know how to stop getting upset about these things. I don't want to keep bringing it up because it seems stupid and I feel like it should be resolved by now, but apparently it isn't.
As an aside, I also have close guy friends, but I can't imagine posting things like that to his Facebook wall, in general, but especially not if I knew he had a girlfriend. I have even showed the posts to some of my females friends who I know have close guy friends, and they also think they're kind of weird. I'm mostly here to figure out ways for me to deal with it personally because I don't really think he's done anything wrong or that there's anything he can do to make me feel better about it beyond what he has done (though if there is something else, then I'm all ears).
Thanks!