Dear _______ and ______;
Yes, I tried. I tried to make things work when there didn't seem to be anyway. I worked hard to be nice, to be polite, to act like we used to act. But you know what? You both did something that will stay with me for the rest of my life. You broke my trust, and even if I glue it back together again, it'll never be the same.
I'm done being mad about it, though; I'm done pretending I'm okay in public and going to my room to be upset. I'm done feeling like I have to be nice to you, that I have to tiptoe around you and respond to your every whim. I'm not going to be mean, no; I'm just done. I'm not obligated to interact with you just because you shoot a text or facebook message my way. I don't have to put myself through the same things over and over and over again, because it's not fair to anyone.
When I feel like I can talk with you without having to pretend, I'll talk to you. But until then, don't expect my heart, because I can't give it.