How do you feel about your SO snap chatting other girls/boys that you don't know?

Ka
Okay so my boyfriend and I have been together for a years or so. The other day I was just looking at his phone and I see a girls name with a heart by it in his snapchats. I have no clue who this girl is. I guess it isn't any of my business but it is really bothersome. Also I went to see her story, and she has posted a blank picture and catpioned it "messing with another girls man, you asking to get f'd up" so I don't know what to think. I don't wanna ask because I'm scared to find out who she is and why he was snap chatting her. 

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