There are probably hundreds of things you did that could have hurt me, some did while others I tried to see reason. The thing that hurts the most though, when all is said and done was the one promise i trusted you not to break. When someone opens up and shares with you why she’s so scared to let anyone in, to give you a chance, when so many others had tried and not really gotten close enough to her to have one, and you betray all the trust she put in you, that’s when you hurt them the most. When someone tells you they have deep fears of being replaced or abandoned… & you promise that you won’t do either, and she’s so scared that she asks you if you’re lying the whole day, and you promise a million times while you hold her and tell her that you’re telling the truth, where do you find the nerve to go against your word. You were never serious. You had girls behind her back and still can make that promise. You’re sick. And now that’s the one thing she can’t understand, the one thing that won’t leave her alone. It’s a cruel cosmic joke that she hates being abbandoned but the one thing she wants most is for you to leave her alone.
Source - cuethehappyending