I need advise!

I need someone to be honest. I don't care if your blunt. I know I'm stupid for this !!!! I'm 22 and my boyfriend is 34 ok. Sooooo,he's done sooooo many shady crap to me... cheated, pushed me down, cursed me out, lied !!!! Etc.... ( we moved past that though!! & started new a year ago ) I met him twice when he was with another girl... he hung out with my group of friends.. I thought he was handsome but didn't pay any attention or anything.. because he was in a relationship !!!! The only thing I said was hi and bye... soo! Five months past by and I see him again. I found out he broke up with his ex that same day I seen him last.. he was with her for like three months.. me and him started to talk out of no were ! It surprised me! I fell in love with him and we've been together for 2 1/2 years. SO MY POINT IS.. he told me that he told his ex when he was with her that I was " SO BEAUTIFUL " and she got jealous & left him...

He checked me out when he was with his ex!!!! I didn't know that until I was 6 months into the relationship and loving him..

Now I'm super insecure !!!! I feel like when ever there's a girl on the tv or walking by with a bikini I feel like he's doing the same.. so I get mad and he doesn't look anymore.. at all. But I still get SOOOOOOOO MAD !! I feel like im going insane! I shouldn't feel this way ! But I can't help it.. please tell me how to get over this ! Or any advise ! I would really appreciate it! I've never acted like this with any of my ex's ! But then again other then him I only had one other relationship that lasted for four years. Other ones weren't really her serious! Please help!