Cheating

I went through my boyfriends camera roll and saw several picture of girls ya know and then I saw a picture of him and some girl, the best part the picture was taken February 22nd the day before our 2 year anniversary. That’s not all that night he said he was going to his “buddies” house and he said it was only gonna be him and 4 other DUDES. Never did he ever say there would be a girl plus they were on the couch with a blanket. I haven’t talked to him about it yet because I’m not sure if it’s just me overreacting or he’s actually been cheating on me.