<human>: Can you give me a shortened version of the text?

So as the title says, I don't want to be dating this girl anymore. We've been dating for just over a year (14 months to be exact) and I can't do it anymore. This is my first "real" relationship that I've been in, so maybe that's part of the reason I'm at such a loss for a solution. 

 Although not recently, she is emotionally abusive in the way that she has to make me feel like shit if she's not getting her way, and she is very controlling of how I spend my time. If I was to go out with friends then she would constantly bother me for not spending time with her, how she has nothing to do now that I'm busy, etc. 

The issue with this though is that none of this is recent, because if she tried something like this now I could build it up and then end it from that but lately she's been nothing but nice to me and its making it very hard for me to want to break up with her. We're both in or last year of high school so my plan was to wait it out until after prom (which was last night) and then end it but I can't think of a way I can do it.

My main reason for wanting to break up is for freedom and to not have to constantly worry and check in with her. I dont dislike her as a person, and I love her family, but I just can't do this anymore.
<bot>: I want to break up with my girlfriend of 14 months because she is overly controlling but lately she's been super nice so I don't know what to do.