His ex girlfriend drains me of self esteem

Before I met my boyfriend I was fairly confident about the way I am, appearance and personality, sure I would've changed a few things but who wouldn't. Since I've had a boyfriend whose ex girlfriend is ridiculously attractive (model), it's like even her presence on facebook, in photos, at college etc just drains me of any self esteem. I can think that I look good, or go through a 'good patch' when I've just forgotten she exists, but as soon as I see a photo or w/e of her it's like I'm the ugliest thing I've ever seen. I know looks aren't everything, but I think my low confidence is sort of getting the best of me, before I met my boyfriend I'd class myself as not your typical girl, who doesn't get jealous or upset about 'girly' things. Maybe it's because I've started on the birth control pill, or that his ex girlfriend is so stupidly better looking than 99% of everyone, I don't know, but everytime he compliments me I automatically think to myself ' yeah but remember you're not his ex girlfriend, not as good'. It's made me feel like I don't deserve him, and it's made me get upset sometimes and tell him that she makes me feel ugly, short and fat. I hate this because it shows him that I'm not as confident in myself (an attractive trait) as I once was, and I'm worried that will make me seem less attractive to him! But I'm in such a mindset where I think, 'well it doesn't matter, because his ex girlfriend is better than you anyway, maybe he thinks you're pretty but he knows she is prettier and he wished you looked like her', and I feel like I don't deserve him or anything anymore! The worst part is that he NEVER makes me feel second best, he treats me so well and always compliments me, I don't want to make him feel inadequate and like he's not enough... he is, it's just I have no confidence since she was ever part of the picture and I just can't seem to get over it! ...... help!!! please!

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