Why would a guy get mad when his mistress talks to other men?

Anonymous
I'm 21 years old and I been with a 32 year man for awhile now he has a girlfriend but he gets mad at what I do he Doesn't want me with other men he hates when I talked to guys he says I'm gonna get rid of him replace him I don't understand why he cares about what I do when I'm not his shouldn't he be worry about what his girl does and not me. why would get so mad when I talked to guys?
Why would a guy get mad when his mistress talks to other men?
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