The girl I'm "seeing" is constantly on snapchat to this other guy? should i be worried?

Hi guys, Me and this are seeing each other and there this guy who is constantly a jerk to her but she seems intent on being friends with him even though he's always rude to her. They constantly message one another and she seems to treat him the same she treats me. whats going on?
Update: she never replies to my streaks but she does to him. it's always me who has to start conversation
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