What does a backrub mean?

Anonymous
I've been hanging out with this girl a whole lot the last few months. I really like her a lot. We've messed around a few times--nothing serious.

She told me Monday that she just wants to be friends and she's going to see this other guy. I was planning to respect that. But yesterday, we ended up spending the whole day together (AGAIN!). Around midnight we were watching a movie at my place, flirting nonstop as usual and leaning up against each other. Then she asked me to give her a back rub, which I did. I was pretty turned on before that, so after a couple minutes, I started kissing her shoulders and cheeks... Then she flipped out and got all p*ssed off. Probably not my best move of all time, but I want to know:

Was I out of line, or is was that a reasonable response?
What does a backrub mean?
4 Opinion