My Husband keeps talking to his friend (opposite sex)?

So I told my husband few years back don't talk to her he said okay. And I caught her msgs on his phone many times all the times he said it's the last time he won't do it again. Now we are married and yesterday I found out he was in touch with her with all those years and he talks to her very sweetly, she has feelings for him and they both talk sweetly not like friends.


what should I do? He says he is guilty? Is this cheating? If they haven't met or sex still cheating? what i do?
My Husband keeps talking to his friend (opposite sex)?
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