I've been wondering about this for a long time and I don't know what to do?

I know this guy and we talk a lot and fight often and when we do we just stop talking for a while then talk again after missing each other , but this time I don't know what happened and instead of talking to me he sent his friend to talk to me pretending that he found my number on an App but I refused to talk to his friend because I knew he was sent by him What should I do?

I've been wondering about this for a long time and I don't know what to do?
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