I'm going to break up with my girlfriend of two years because she's decided to abstain due to her parents finding out
You can't have a relationship without sex with her?
I'm too attracted to her, if she stops talking to me I can't get over it.
It's fine to want some physical intimacy in a relationship. That being said, you may not want to end a relationship over it if it's only temporary.
I'm not sure about that, but I do know that I'm using that as an excuse.
You should be honest about why you want to break up if you do. You shouldn't use an excuse instead of giving a valid reason in a sensitive manner.