Do what? Tickle people? Step on peoples feet? Have a girlfriend? What are you referring to?
When I translated it above, I assumed he meant that he didn't want to hurt his girlfriend's feelings again by putting her in that kind of position, because that's probably what he's feeling most bad about.
And more to the point, how did any of this make your girlfriend want to break up with you?
From the way OP speaks and his previous posts, it's pretty clear he's young. This is probably a 13yo boy (since it's become all the rage these days for young kids to get into relationships early) and his partner got angry because she got in trouble. If one of my friends dobbed me in when I was young, I'd be loving pissed too.