You'll regret what you've done to me.

I hope one day you will realize I did truly care for you. I promise you, you’re going to miss me being there, putting up with you, and refusing to give up on you. You’re going to regret everything you've done to me, including all the damage you caused. Someday, you’ll look back and wish things could have be different. I might have been worthless to you, but I am of great value to myself.