<human>: I've been with my gf for 10months now and she is such an amazing person. I love her but I know that she isn't the one who im going to marry... I just don't feel it. It isn't her...

This sucks. 

I don't want to waste her time, I don't want hurt her either. 

We've talked about the relationship direction and she wants to be married in a couple years from now. The longer I stay with her the worse it's going to be to breakup down the road. 

I hate the thought of making her sad. 

I can't stand this.

Summarize the given text in a few sentences.
<bot>: I don't know if / when / I should break up with my gf if I know she's not the one for marriage.