I am done with playing the field / how to act when we next meet

When me and my long term boyfriend broke up 8 months ago, i decided to play the field, to have fun and fool around a little bit because i never had before & so many people were saying it was great. After the break up i knew it was going to take a long time before i would get into another relationship and the advise seemed really appealing. I had a works conference coming up in the USA and although i wasnt planning on doing anything at the conference, I did!! One night i got drunk and slept with a guy from the London office but we are still on good terms and no one knows. Even now we get on and it doesnt affect me, even though i know it doesnt sound good. Anyway, halfway through the week i met a really cute guy who works in the American Office (i am based in the London office). At first he spotted me and came over and was really nice and it all seemed really innocent. We spent the evening drinking and he stayed at mine BUT nothing happend. The next day everyone was encouraging us to go on a date, so i ended up giving him my number and we met up. He came over to the hotel, with a bottle of wine and yes you guessed it, We had sex. Luckily the next day i was at an offiste meeting so i didnt see him, but we did text. The day after was my last day and i was catching an evening flight. I text him to see if he was free and he said he was and to come to the office. I decided to take a stroll first and then made it to the office about an hour after the text. When i got there he seemed aloof and was working. He told me that just after the text he had been pulled into a meeting and been given a lot of work. I sat down for 5 mins but i got the hint, so i picked up my stuff and said i would work over the other side and let him get on with his work. Just as i was about to walk out of the office, he came after me and got in the lift. Unfortuantley people were in the lift so neither of us said much much just as i got out he gave me a hug and said keep in touch. I know this doesnt mean anything and i know he was just being a nice guy but it did make me feel better. Also, the minute i landed in london i recived a text from him to say have a safe flight. I know, this is not a lot but it made me smile. We are facebook friends but we dont chat. We occasionally like eachothers posts/photos, but even that has stopped now. So its been 6 months and in the meantime i have been partying, holidaying including Vegas, i had one holiday fling and then met a random guy in London who i am casually seeing ATM YET, Not one of these guys has had the same affect on me as the American and im really worried about how to act when i next see him at the conference. I really relise how stupid i was being and regret it. I think he might even have a girlfriend now (i am not sure). I know it is my fault, and im not acting in the best way but i really need advise, preferbly from a guy, on how to deal with this when we next meet. Do i say hi and act normal or do i just igmore him? Advise please and please dont be to harsh with your comments. :-)

hey, i wouldn't read much into it. I'm male by the way and it sounds to me like he is just an all around good guy. He may be like me, not really knowing how to act after a one nighter so to speak. if you really like him then you should let him know, i mean whats the worst that can happen? if he says he isn't interested then fine you know were you stand . Should that be the case he will more than likely be nice about it and if he really is that nice then he won't make you feel awkward and he will have a little ego boost in the process

Thank you for your nice response. This helps. I think I am over thinking things :-) The next time i see him i will just act normally. Perhaps I actually like the guy Thanks again