In love with my old housemate?

I was a living with a few people a while ago in a shared house in Leeds. At the time I was having various 'one night stands' with girls. There was a guy who lived in the room above me, nice guy, quite, a bit conservative, we got on alright, he never had girl over or anything lke that. Anyway at the time I got an inkling sometimes that he was interested in me, as a friend probably, nothing more. And at the time i didn't really take much notice of him. But now, about half a year later, I suddenly realised I was in love with him! I mean really in love. Now i don't care about the being gay thing at all, i've never really had it that strongly. But I have had dreams about him lately. It seems really odd that i've only just realised now all this time later.. anyway he probably wasn't gay, so he probably wouldn't love me at all.. and i havn't spoken to him in a long time... it's just very strange! Has anyone else felt like this.. when it suddenly hits them a long time afterwards?