Why won't he break up with her?

My lover is with a girl who is really ugly. Not to be mean, but her face could turn men to stone and even the most talented plastic surgeon in the country couldn't fix it! He also told me--unprompted--that he can't get it up for her unless he's totally drunk. I want to be clear--I am not in the least interested in having a relationship which is why this situation works so well for me. I just can't get my mind around why he's with her!
Why won't he break up with her?
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