She may not have vocalized it to you, but you are hurting her.

It's a very delicate situation and I'm also not happy that she brought the relationship thing up again. The last time she did that (which was at the beginning of this year) I wondered if it is time to stop all of this. Interestingly she mentioned, that this is better than nothing and she would like to continue with what we have.

There was an important event that changed the game anyway: I had a vasectomy at the beginning of this year. We never talked about it before. I told her straight after I got the appointement and she was not happy with knowing, that I can't have any children anymore. Since then she never pushed toward a relationship ever again.