<human>: Give me the gist of the text in a nutshell

We've been dating for over 3 years. At the beginning she was shy and avoided even talking about anything of a sexual nature. 

Over time she opened up a little more. We lost virginity to each other, although when it came to sex she never seemed fully invested and it often seemed like she was just doing it to keep me happy. 

Because of this I became less and less insistent on sexual relations, repressing my own desires to a considerable degree. Now she can't even stomach something as small as a hug occasionally if she's "not in that kind of mood".

We get along in a conversational way but I need more than that in a relationship. I feel like I'm not receiving the level of intimacy I require. 

I'm about 90% sure I want to end it but I can't even bring myself to talk about these issues, never mind the idea of breaking up. If anyone here has been in a similar situation I would really appreciate some advice from experience.
<bot>: Girlfriend of 3 years who initially wasn't pushed on sexual relations has completely lost interest sexually and I want out. How do I approach this?