Well, here's the problem, I've been with my girfriend for three months and two months ago i met one of her best girlfriends, and every time I go to talk to my GF that friend sends me IOI, and even more when my GF is not around.
The main problem is that she is a HB9, she is a good girl, smart, cheerful, friendly... and I think I have oneitis.
Well, I'm sure.

I like my GF, and she is very in love, I don't want to hurt her, how can I get rid of oneitis if I see that girl everyday and I can't play other girls to forget her because I have a girlfriend?

I know this is weird, but I'd thank any advice.

It's not "oneitis" if she's your girlfriend, mate. Do you value your current relationship, or are you just looking to hook up? In the case of the former, you should either forget about your girlfriend's friend, or, better yet, put her on the back burner in case things go south with your current girlfriend. If the latter is true, though, then break it off with the current girlfriend so you can pursue her friend or whomever. There's no sense in wasting your time and hers with a relationship that doesn't mean anything.

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MrGiggles

Totally agree with MrGiggles. Don't confuse one-itis with a dedicated relationship.