Need some advice...

[pinkpanda3310]

It sounds to me like your asking us because he is borderline of going too far for your comfort. The guy is obviously not stable so the more distance the better IMO. It doesn't sound like he will stop anytime soon, matter of fact sounds like he's on a downhill slide. If it was me I would tell him on no uncertain terms and maybe even change GF's number. Of course, by doing so you are going to stir his emotions but I would think the sooner you get GF off his list the better. He is not your friend so you are not going to help him through anything.

My method is not sound advice but distancing yourself some how is the best IMO.

[JThiessen]

Leave it alone. Your GF is doing a fine job of handling it, and unless you consider yourself a friend of his, you have no business with those other gals - they will handle their end of it.
My daughter had a similar experience with some guy randomly texting her. Her boyfriend flipped out, just one of his many episodes of jealosy. And that's why he's no longer dating that 6'1" model.....