Yesterday you told me you had made a list of all the ways that loving me has ruined your life. And I get it, I haven’t made it easy on you, but I made a list, too, of all the ways that loving you has changed mine. You were by my side when I needed a friend, you made me laugh, you made me dance, you told me that I’d find love again. And I understand if you need time to heal and to live your life without me. I understand if I have to wait for you. And I will. I’ll wait. And when you’re ready for me, I will be ready for you.
—  Stefan to Caroline in 6x22

The thing is Damon loved Elena in every way he possibly could. When she was good or evil, happy or sad, with her emotions to him or without. Delena was the relationship which broke every barrier and made Damon Salvatore a crazy in love man. And that’s why millions of teenage girls couldn’t do anything but cry yesterday evening.