Photo.. Edited

I looked through my partners phone earlier & saw a photo of him and a girl from when he was out on the weekend. I said to him about it and he could see I didn't like it. He said she is just a friend of a friend and was just a harmless selfie. She's holding his phone n took the photos. I'm currently in bed crying but I keep thinking I'm over thinking it all, would anyone else feel really angry and upset about this?? 😔😔 ** they were sat next to each other one photo she had her tongue out the other she looks like she's laughing They were literally touching heads.