Can a guy slap a girl he loves and respects?

I was with my boyfriend when my mom buzzed and it was an important message from my mom which I had to reply immediately. My boyfriend slapped me (with moderate intensity) and instantly felt and said sorry. It was an impulse. Before this he has slapped me lightly sexually in bed. I am confused, how can some guy slap a girl whom he loves and respects and wants to spend life with? One correction about the age: I am 25 and he is 32.

Can a guy slap a girl he loves and respects?
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