I hit my boyfriend and he hit me back?

I got angry and did something stupid. I slapped my boyfriend. But then he hit me back and I have a bruise now. What should I do? It was my fault for initiating the violence but I have to admit I never thought he would hit me back. It hurt. And I've never been hit by a guy before.

I guess I'm abusive as well. Should we just break up?
I hit my boyfriend and he hit me back?
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