I've seen in others that love exists even though I've never fallen in love myself. I don't understand how having a bad experience with love makes you a non-believer; if anything it proves that it exists because you've had an experience of it to begin with regardless of whether it was positive or negative.
Well when it comes to guys not really, since I know the way gay community works and it's just saddening to see and I don't really see myself loving a guy.
With girls, definitely. I've experienced it once although I'm very young myself.