Answer
If your wife regularly talks to another man, you may sit down with her and let her know that, besides that this behavior is sinful and not correct Islamically, it hurts you and your feelings.
She needs to know that you love her and want to save your marriage.
She also needs to know that for Muslims, there is a clear line between women and non-mahrams and vice versa.
You can expect your wife not to befriend other men; make this clear for her.
You might involve her mother as well if you think that she has a positive influence on your wife.
What else to do in a situation like this?
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