Told my girlfriend I think i might be gay.

So i made this post a few days ago (rather than explaining it all again) http://emptyclosets.com/forum/sexual-romantic-orientation/152090-unsure-confused.html

The last few days since posting this have been an emotional roller-coaster. The day after posting that she took one look at me first thing in the morning and i just completely broke down in tears. Told her everything that had been going on in my head.

She was amazing about it. She told me she never really thought i was gay and that bi-sexuality comment was just a joke. We opened up about everything and she was disappointed i hadn't said anything sooner and bit hurt i convinced her so well everything was fine. So i know it'd take her some time to completely trust me again.

The thing is, just seeing her naked gets me aroused. I love everything about her body even if she doesn't. But i can't deny that when i'm away from her, the thought of gay sex is a turn on. I don't watch porn, i look at girls in the street, occasionally look at guys but the thought of doing stuff with a guy gets me going.

I'm so confused and i don't want to be in denial and hurt an incredible woman that's given me so much. I want to give her the world but afraid that further down the line i might realize i'm actually gay and feel like i've lied to her. She thinks it's just my OCD and just a fantasy and doesn't even mind if i think about it whilst we have sex, so long as actually love her and don't need to think of a guy to want to have sex with her. And don't have sex with her just to reassure myself (completely understandle)
I'd agree with the OCD part up until a week ago until i let go of it all and just wanted to see if thinking of it did turn me on.

I really don't know what to do. I don't want to throw away a perfect relationship and i couldn't ever expect her to keep her door open if i went off to experiment. Sometimes i just want to end it and not hurt her anymore but i know i'm happier with her.

Any advice is really appreciated.