Love Hurts?

I have always heard love hurts and I could never really understand what it ment. I now know how love can hurt so bad, like a dagger going into the heart. Except the pain is much deeper and more intence. I don't really see how a love that is or was so strong can go so wrong. I don't like to think about it because it hurts me so deeply. I am working on expressing my feelings, which I am not good at. I don't like to cry in front of anyone, I know it is normal. I just need to learn how to cope with my feelings.