Boyfriend lusting after other girls?

Anonymous
I've been with my boyfriend for nearly a year but a couple of days ago I found out that he's been looking at photos of girls that I know casually, and also of my friends. At uni we have a ball where everyone has to go in their lingerie and he's looked through hundreds of these photos, sometimes logging on to my facebook account so he can get to these albums. At the same time that he's looking at these he'll text me about how horny he is and sends me dirty messages about what he's doing so I know he is masturbating over these girls/my friends.

I just don't know what to do, part of me says just leave it and try and forget about it, but I know that I won't forget and I can't. I have very low self-esteem about the way I look and now I can't get these images out of my head and the fact that he wants to be with them when I look totally different to them so am obviously not his type (i'm taller and fatter and these girls are short and very skinny).

Also, he is messaging this girl that he was in love just before we got together, and at the beginning of our relationship he would stay up all night talking to her on MSN whilst I was asleep next to him, and now he's been messaging her again so I can't help thinking how he wishes she would have wanted to be with him, the way he did with her.

I don't know if I'll be able to work things out with him, I don't know if I can trust him and the fact that he is lusting after all these girls just means that he doesn't find me attractive and I don't satisfy him doesn't it?

Its just hurting me so much to know that those girls are what he wants, and that's not me, and what must he think of me when he's comparing me to them? I feel sick.
Boyfriend lusting after other girls?
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