Ghosted me???

So this guy and I went out on a few dates (maybe like 4) and I had told him I wasn’t looking to hook up or anything buuuuttt we ended up hooking up on the third date bc I gave in and honestly I figured I blew it with this guy bc he would always talk down to me about girls who were super easy.. anyways he invites me out again after we hookup so I was super happy, but the whole date we rarely spoke to each other.. I could feel the distance as I even had to ask him for a kiss when he dropped me off.. after that he just stopped talking to me.. do you think it was bc of the sex? maybe because our last date didn’t go well? idk on that last date he introduced to his whole friend group which I thought was a step forward.. then the other day he responds to one of my stories on snapchat super casually as if he hadn’t ignored my text message & ghosted me ???? Ahh the confusion