I feel really left out of this relationship ?

Me and a guy I had a thing with broke the other day. 2 of my friends went to the neighborhood of the guy that broke up with me. They went to the guys bestfriends house, (they are next door neighbors) and the guy that broke up with me is also with them . They are all over the guy that broke up with me's house right now having a good time. I cant really tell them I dont want them going over there, cause I dont care if they do. Im just jealous that they are all having a good time without me and im jealous. Ive never even been to the guy that broke up with me's house. I feel really left out. I called them and they seem like they are having fun, and im just really jealous. They are having fun, i feel like the outsider. And me and the guy that ended it with me arent talking, and probably never will.