Me and my ex got in a fight?

Me and my ex were talkimg bout gettting back togther until he saw msgs from other guys but it wasn't nothing serious. Im not even talking to them in that level and we haven't been togther for 4 months. And I've heard he was messing with this girl. I confronted him bout and he said he dont want nothing do with her. Now he dont want to work things out anymore cause he saw that. I dont get what i did wrong can someone help what should i do. Ireally do want him back.
Me and my ex got in a fight?
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