Falling Inlove

so, i'm a 22-year-old guy living in seoul (moved there from busan). i've never fallen in love - i make it a rule never to sleep with the same person more than once (i'm more of the one-night-stand type), and i'm pretty content that way. relationships are too messy, and i have no interest in them.
however, there's something that's been irritating me lately. i slept with this guy recently, and actually started talking to him (over katalk) (we'd also go out for drinks). i didn't have a relationship in mind - we just talked about shit like our latest "conquests" (or so we called them - as a joke, of course). i later learned that he had a girlfriend (dude, why are you even sleeping with other people when you have a girlfriend?), and that he was "just experimenting" with guys. why did that make me feel slightly disappointed? i'm not sure what i was expecting from a kinda-friendship (that had once been only a one-night-stand), and i'm seriously pissed off at myself for having these weird thoughts. i'd vowed never to fall in love, and i was sure i had pretty decent control over my emotions - what the fuck are these thoughts? he's even got a girlfriend (straight guy, probably, who had one too many drinks and decided to do it with a guy). but, get this - the other day, the asshole started rambling about having feelings for me and shit (after he had just a few drinks), and tried to kiss me. my brain was so fucked up at the moment that i just paid the bill and left without saying anything (a dick move, but i was also pretty drunk, so it's not as if i was thinking straight). i'm pretty sure he doesn't even remember what happened yesterday, as he's been messaging me as per fucking usual, as if nothing happened. the fact that i'm having these feelings pisses me off, and the fact that they're for a dickhead who's screwing around behind his girlfriend's back makes me even more irritated. so - advice?? i don't even fucking know.

so i fell inlove with my bestfriend when i was a child and to keep things short HE DISAPPEARED & LEFT ME WITH A MOUTH WIDE OPEN FOR ALMOST 6 YEARS AND STILL COUTING, he kinda "confessed" about having a crush on me, i didnt respond, i opened my closet wide for him, he didnt respond, now gone & ive been finding/chasing him to clear things out.
i had been dreaming of a tru-- i mean,, ive been having dreams about him lately and when i seem to forget him, my dreams comes back like its payback bitch to remind me of him again. he became my childhood when i was like 10 and he just suddenly disappeared without having a nice properly done talk after expressing his feelings SHORTLY, my old childhood frens also sometimes ask me about him and "us" or if i even have him in my friends lists in facebook (which i dont and not bothered about it.)
what im concerned about is that we never really had a nice talk and my fckng dreams are torturing me even though its not frequent that he appears on one, its just that after i dream i tend to search for why so. i searched google about it and it said that when im dreaming about someone its just that this person im dreaming of is wondering about me and its bugging me because that feeling of "hes wondering about me" bugs me.. when he just left me without saying anything..
now at the time of writing this i searched "dreams about childhood friend" and google said that i just wanted to be more irresponsible/have fun in life and it kinda makes sense.. and not im fckng confused! dear god, just why did he left me with a mouth wide open for di-- questions..., questions. i have so many things to ask him now that hes gone but i never got to ask when he appears infront of me like almost once every year?! and now he acts like he doesnt even know me or that we just never met or he never confessed! like wtf how can you not be bothered by that?
did i got something wrong? or just that im not explaining too much to supply you guys with more story?
anyways he left after he confessed and that left me confused but i dont tend to get bothered by it too much or not in a depression state cause of it or anything its just that its irritating that he left without saying anything! he never showed after that.
*im sorry if its long or there are misunderstandments, thank you if you have gotten this far and i hope i didnt waste your precious time, i just wanted answers & merry christmas + happy new year.*
ps. im a boy and hes a boy
pps. helloooo philippines
ppps. i can still see him its just that its kinda rare if i do and we act like we never know each other if we happen to cross paths