<human>: I'm 21/F and have been with my boyfriend, 24, for a year and a half now. 

2 months ago he left me, he slept with another girl within the month we were apart. We're working through that part fine.

The only thing that seems to be getting worse is my jealousy. I never had an issue with it before as I had no reason to feel threatened, he seemed to want to be with me and I trusted him but after him leaving out the blue I can't seem to let myself fall into a sense of security.

I now find it difficult to watch films or shows with actresses I know he finds attractive, whenever an attractive girl walks down the street I find myself staring at him to see if he's looking at her, if we come across a good looking girls photo on imgur or reddit I skip past it really quickly as I don't want him to see it. It is ridiculous! I know how crazy I'm behaving and I haven't stopped him from doing anything because of my jealousy as I know it's totally irrational but it's eating me up inside.

I can't stop thinking that he's comparing me to every other good looking, funny, intelligent or quirky girl out there. I haven't been able to get naked in front of him for nearly 3 months which then makes me even more paranoid as whenever I see a confident girl I think he wishes he could be with her. I then act like a TOTAL bitch and point out the girls flaws to put him off which is ridiculous, if I don't want him to judge my imperfections I should stop doing it to other girls.

I'm worried that I'm going to start taking it out on him, I find myself making comments about him looking at other girls and I don't want to be one of those people. I constantly look twice if I see a good looking guy, there's no harm in it, so why shouldn't he be able to. Today I saw a photo of an old friend from my school, she's just had a boob job and looks amazing and I became so jealous that I started to get moody....what the hell! I just don't know how to stop.

Can you condense the text into three sentences or less?
<bot>: I'm jealous of pretty much every other female when it comes to my boyfriend and I don't know how to get a grip of myself.