After I dumped him me and him fooled about for a few months until I found my current boyfriend. He then turned nasty to me saying how he hated me and never loved me and only used me for sex. Of course he didn't like it, but this guy made me happy and 6 months down the line my ex now has a new girlfriend and it feels like it bugs me and I feel somewhat jealous. He's 18 dating a 15 year old girl, who in the same year as my little sister at school.
Before I found out he was with this girl he used to message me trying to tell me he was sleeping and seein someone and if I was jealous and all this stuff. But he hasn't made it public he's dating her. I saw through her tweets, and my little sister found out. By his new girlfriends tweets he doesn't seem to be treating her right and he hasn't tried to rub it in my face. I can't get over this jealous feeling even though I a perfectly happy relationship?