Should I confront him?

Val😻
So me and this guy been talking for a while all summer and we had sex a couple times. We would text on and off hang out on and off, but today I get on Instagram and I see on his page he's posted in a lot of pictures with this girl' the same girl at that. And the pictures were taking some of the times me and him would hang out. I'm just confused like why didn't he tell me he had an gf I asked him and everything he said no I even asked him on sweetest day where's his sweetie' don't you have one he said no. 🤔