Why does it hurt so much?

Sometimes I wish I had no feelings. I wish it was easier to move on and just stop thinking about someone you really like. Especially if the feelings arent mutual anymore. I mean how stupid of me to even shed a tear. But I just can't help it. I've known this guy for only 7 months, I mentioned commitment and he runs away. Was he fake all this time? Ugh so frustrated and sad.