No smile

I can't believe that I did not know anything about it and fell for it. Ohgosh, please tell me why? Please tell me why am I always falling for guys who can't like/love only 1 girl? I'm tired of liking/loving someone for a damn freaking long time and then to find out that he is already attached/likes someone else. I've given up.
Love does not exist. It's just stupidity.