Thanks both of you, for your reply.

That given me a lot of insight actually, so thank you.
Im not sure why Im so into a the girl I barely know..attraction I guess. We like similar things, we both play roller derby, we are in nearby teams, sometimes we've trained together - so I guess a common interest and I just happened to be really attracted to her - and she has said the same thing.
Lauru - Im really sorry to hear you were cheated on like that. That must have been incredibly hard going. I understand, because Ive come out of a 4yr relationship with a woman (who didn't have bi-polar) who cheated on me with a friend. I've personally never done that to anyone. Im not into casual relationships, so this is quite new to me. Im incredibly sensitive and I do tend to give my all to someone and find it hard to just have sex without an immense emotion and deep feelings. So this is very strange for me, and probably why its on my mind so much too - I'm not sure how i feel about a non monogamous relationship...my instinct is that It is not for me. But I'm finding it hard to pull back from this girl - something is really pulling me to her. We've not had any sexual contact yet, I think I holding back for the same reason...im concerned that once Ive crossed that line, I'm into a whole different thing.