Is it a red flag if my boyfriend is mad about me practicing dance with my brother in law?

Anonymous
My dance classes are closed since the begin of this pandemic and as my brother in law is a dancer too we usually practice together.
And as dancing involves lots of touching and intimacy it's obvious that we two got a little bit closer to each other. And my sister is completely fine with it, as she likes to dance with him too.

And my boyfriend has no f*cking idea about what dancing even is so when he saw me dancing with him he got mad. He's even using terms like, "I'm not a cuck" or "I won't be dating someone's leftover".
And it's disgusting to know that my boyfriend thinks of these type of things.

Is he overreacting? Is it a red flag? Should I break up?
Is it a red flag if my boyfriend is mad about me practicing dance with my brother in law?
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