Who spanked the woman?

Choices:
A. Other women
B. Her abuser while growing up
C. Her boyfriend
D. not enough information
Her boyfriend
Well we're not married (yet), but one time my boyfriend playfully spanked me. Hard.
I know he didn't mean to hurt me, but I was mad about it all. Day. Long. I just couldn't get over the fact that he technically hit me! I started to consider things like, “Is he really sorry?” “Will he do it again?” “Should I leave him?”
And gave myself reasons like “He didn't mean to!” “He's been apologizing all day!” “He was just playing!” “He meant to have fun, He's sorry!”
Yet countered it with one simple statement, “Yeah that's what all abused women say.”
In the end, I felt the question that should determine whether or not I should leave is: “If I stop talking to him tomorrow and can never see him or speak to him again, will I be okay with that?” and the answer was “No”, so obviously I shouldn't leave him.
He is very well aware that I was considering leaving him, (I have a very strict 0 tolerance policy of abuse in my relationships, as I was abused terribly growing up,) and he still apologizes to this day, but he has certainly made it a point to never do that again. I definitely trust him, and he actually was being playful, but otherwise that has been the only “real” hitch we have come across.
I mean, we argue, but that's only when either of us are mad, and it's usually over small stupid stuff. Like, really stupid stuff. We argued over traffic signs before, LOL. It always leads to me saying the argument is completely retarded and we drop it and just cuddle or something. Really not worth getting worked up about.
Edit: Fixed some typos. I'm on my phone so my thumbs can't quite reach LOL.