Search Results: rebound girl

Hello everyone,
There is something I don’t get and maybe you can enlighten me on this.
I had a non-commited relationship with a guy for two years, on and off. I rejected him when we first met but we became intimate. He never cut me off his life and I never did. I felt madly in love with him but never told him. I though he cared about me, but I don’t get his behaviour.

Everytime he finds a new girl, he rubs his new relationship in my face. I’m the first he tells about it like « I always tell you everything so you have to know I’m in love with this girl ». Then we fight, take some distance. He posts pics of his new girl while he never posts anything. He refuses to follow me back on ig while he follows a lot of girls he doesn’t care about. He mentions the girl he is with in purpose, when it’s not meant to be.

Exemple : we were closed to date / commit both of us, he announced me he was in love with his best friend. It’s been like three weeks they date I guess. Yesterday I reacted to his story and immediately he changed his profile pic with a pic of him and her (that dates back a month ago when they were still friends..)

He told me I’m his ex but we have never been official. All his relationships last a month, I’m afraid this one is real.
Can we consider he acts like an ex in rebound relationships? Is he doing all this to make me jealous but why, since he never asked me to be his girlfriend?

Thanks a lot for your help