How do I stop comparing myself to my boyfriend's ex girlfriend?

xoamjk92x
I've been with my boyfriend for a year now, and before me, he was with his ex girlfriend for a little over a month. My boyfriend and I live in New York for school, but he is originally from New Jersey, and so is his girlfriend.

I constantly check her Facebook, and look at her pictures and comments and friends. I don't actually care what's going on in her life, I just want to see if she's prettier than I am, or more outgoing and social. Which she is.

I'm so afraid that he's going to leave me and go back to her because he realizes that I'm boring and whatnot.

He says he didn't even like her that much, that he doesn't think she's pretty, and that they don't hang out, just text sometimes.

I don't want to be the girl that says he can't be friends with her, but they only text at night, and sometimes its flirty-texts.

How can I stop myself from feeling like this? If I even can?
How do I stop comparing myself to my boyfriend's ex girlfriend?
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