There has been an awful lot of activity on this thread since I last checked it. Thank you all for responding - whether you think it was or wasn't rape.
I have no desire to be a rape victim and I agree with
@joeylittle that labelling it might not help me. I was just looking for clarity in case it helped me to move on - this is why I wrote in this forum in the first place.
I just want to clear a few things up. I have not confronted him about this yet (I am not sure if I will - but have no immediate plan to) so he has no idea that I think he might have raped me, he just thinks I'm ignoring him (hence why he contacted me asking why). I have not gone to the authorities. Since starting this thread I have spoken to a few more people about what happened and my boyfriend, my friend, and parents have encouraged me to - but (partly for reasons addressed in the above debate) I have no plans to do that either at present. My question for
@RussH was more motivated by wondering what step I could take if I chose to.
My main motivation for doing so would be, given that this person is in a friendship group of mine, what if another one of my friends reveals a similar story about him in 6 months time. Or a stranger does - and I could have prevented them from going through that. I think the counter to that has been expressed above. Damaging (or ruining) a potentially innocent mans life is not something I wish to be responsible for.
I doubt, given my uncertainity, that I will ever come forward. Even if I decide that I think, on balance, it was rape.
I am aware that I made several bad decisions on that evening, and subsequently - that I do not deny. It was my decision to get drunk even though it probably wasn't the best idea. I could have said no to that. I could not have said yes or no to what happened afterwards because of how drunk I was - and I will never agree with what some of statements above imply. Namely that the decision to be drunk around him gave implicit consent and therefore it definitely wasn't rape.
He may have been as drunk as I was and not realised that he was taking advantage of me, but he has told me that he remembers the evening. I do think that he took advantage - either he is aware of that (so he is not my friend) or his definition of what is not taking advantage of someone differs greatly from mine (so he is not my friend). I also think that he is not my friend because of how he manipulated me into not telling anyone.
Either way I have cut off all communiction with him and I am now seeking professional help. I think the idea that I should just chalk it up to experience, "learn my lesson" (that I can't trust people? even if they're supposed to be my friend? I'd rather not) and move on is a little unfair - particularly given the setting.
I chose to do, or not do, dangerous things all the time - for e.g. driving. If I crash my car into a wall and get hurt it's my fault. I will take responsibility. If someone crashes into me and I get hurt it is not my fault. I made the decision to get into that car and drive it around - but it is not my fault someone crashed into me.
The logic applies here - I made the decision to get drunk with someone I thought was my friend. That did not give him permission to rape me (or "take advantage" of me). It is not my fault.