Am I overreacting or no and what should I do about him?

So my boyfriend keeps talking to a girl that clearly makes me feel uncomfortable. He has been friends with her for three years but I heard from his other friends he had a sexual relationship with her in the past before we got into a relationship. He keeps denying it. She just criticized me and makes fun of me to him. I told him to stop talking to her and he said he would like three times but I keep seeing he keeps talking to her behind my back. Am I overreacting for not wanting him to talk to her and what should I do because he is not respecting what I ask of him.

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Am I overreacting or no and what should I do about him?
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