confusion..

How does any of this make sense?
You have a new girlfriend and yeah it hurts me like crazy to know that you are with someone else. That you were so easily capable of throwing away six years together within a matter of weeks. I know she is just a rebound and I know she doesn't mean much to you, because if she did.. you wouldn't be contacting me almost daily, just to chat about whatever. You wouldn't see me behind her back. I know that I know you better than anyone else, I understand you in a way that no one else does and maybe no one else ever could. Is that why you keep me around, for your own benefit? Because you know that I'll be there for you, anytime of the day?

I really don't understand... we were in love and you threw it all away. But why are you keeping me around?
I guess maybe if there wasn't someone else I wouldn't be so confused but there is.. so what's the point of all this?