I understand what youre saying about other girls looking more attractive everyday (i've been with my gf for three and a half years now) but you really don't know much about her friend. The relationship you have with her is based on lust and not too much else right now. Its possible she might be the one but you won't know that until you get to know her better. If youre that unhappy, you should call things off with your girlfriend and get to know her friend better before you jump into anything. Just my two cents, hope it helps.
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