My coworkers try to destroy my boyfriend?

They make comments about him having sex with whores, they hint he does
Then they says its just a suggestion because he talks about personal stuff with them
He says he is loyal to me and also I know he wouldn't say that stuff to them
I didn't comment anything yet, because people keep saying bullshit about him so Im not surr how to tell him them
He can get angry and say :do you believe the bullshit people talk or me?
Should I comment it to him?
My coworkers try to destroy my boyfriend?
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