My boyfriend talks to other girl and have sex chat with them what should I do?

So I am in relation where my boyfriend have sex chat with other girls but when I told him to have it with me he gives me reason but we share very good sex life.
And he’s very sweet n nice and take 100 % care of me. But when it comes to sex chat he avoids me for this but does with other.
He never says no for sex but why he says no to me for sex chat?
My boyfriend talks to other girl and have sex chat with them what should I do?
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