Why would a guy get upset and say I was going off on him that he be jumping back and forth with woman?

I said you can do that with other woman but I’m done with you that’s it he went and told that girl and she tried having a talk with me how I went off on him and was talking to his little friends like at this point why even bother or care and why try calling my name after that talk we just had am I overthinking y’all or what please help me I’m little lost tbh

Why would a guy get upset and say I was going off on him that he be jumping back and forth with woman?
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