ugh

I had this decent little story going on. About a vampire vs two boys in love, complete with a threesome right behind the sideshow trailers at the fair, all fun and I liked it a lot. And the end FELL APART COMPLETELY. I don't know how to fix it. I've never had something happen exactly like this before, getting all trite and rote and tired right at the end. How does this happen? Haven't been able to slog my way out yet, and I was so sure I'd be finished today and here I am instead. So discouraged.

EDIT: I think it's fixed. In short, I panicked, just wanted the thing DONE and in the process stopped listening to how the characters would deal with things, went trite, overboard and lost all feeling. Yeah, panicked, all right. I've since stepped back/settled down and mostly (hopefully) managed to get it in shape. I appreciate those of you who talked with me about it:)