Why am I so insecure in my relationship?

Anonymous
I've been with my boyfriend for a little over a year.. We've been living together for about 4 months. Most of the time I'm incredibly happy and in love. I'm a heavy set girl and he's very toned & athletic.. He makes me feel like I'm the most gorgeous woman in the whole world..

Having said that, lately I've been snooping around his stuff (fb, IG, texts) TRYING to catch him doing something.. The problem is.. He's not doing anything. Whenever he bumps into an old girlfriend/fling while we're out and about.. I get really annoyed that he's still nice to them. When I see that he's been chatting with a girl on FB (about completely harmless thing) I completely blow up at him.

What's wrong with me!? Why am I so eager to try and catch my boyfriend cheating on me? I need help because he may love me now.. But I'm afraid my craziness will completely drive him away one day :(
Why am I so insecure in my relationship?
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