I'm selfish for making you the person I depend on and my shoulder to cry on and my backbone to stand up with because I didn't need you but I made me need you
You're selfish for telling me it was okay and that you would always be there for me. You're selfish for promising me a backbone and when I need you you let me fall down.
I'm selfish for wanting you to stick to your promises, but you're selfish for making them.
And you're selfish for leaving, but I guess that makes me selfish for wanting you to stay.