My girlfriend slapped me, should I break up with her?

Anonymous
My girlfriend got really mad at me for texting my ex. My ex texted me just checking in. (we haven't talked for like 3 months and I broke with her) She asked how I was and I said I was good and didn't ask anything else. Basically that was the whole conversation. Well, when my current girlfriend found out about the texts she started saying how our relationship wasn't important enough to me, and how maybe I should just be with my ex since I only care about her. She was making such a big deal about it, that I just said " Casey, why are you so fricken insecure?"and she slapped me and yelled "I am not insecure!" and then grabbed her jacket and left.

I'm so mad and confused. Should I break up with her for slapping me?
My girlfriend slapped me, should I break up with her?
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