I am in love with a guy who is committed to another girl for 4 years. He loves his girlfriend very much. I know he'll never fall for me. Now, I feel heart-broken.. how do I get over this feeling?

You move on. You would be wasting your time.

How do I move on... when all the time I'm thinking that how unfortunate I am, to not have him in my life?

Get off the pity pot and build a life that you enjoy without him. That how you move forward knowing you have no chance with him, and no choice either, because he has someone already.

Why waste time wanting what you know you can't have?