A guy disrespects me and my "boyfriend" does nothing what do I do?

Ok so, i and my boyfriend are in a cab, and because of a petty issue, a stranger who was outside the parked cab slaps me and pulls on my hair, not only that, he also rants on me and insults me, and my boyfriend says nothing at all. The driver had to break the issue up and then we drove off, after which my boyfriend just says sorry... sorry? This isn't the only time, sometimes he disrespects me in front of his friends too, I've confronted him about it buh nothing changes.
A guy disrespects me and my "boyfriend" does nothing what do I do?
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