Are we dating???

A few weeks ago I went out with friends and a coworker. The coworker and I hooked up. At first I thought it was just a hook up, like a one and done. But this past week at work he kept talking about going out for drinks after work. We did and we hooked up again. Then yesterday we went out to another bar but this time he stayed at my place after. He was super affectionate all night and in the morning. We had a convo after and we laughed about the night. He then said we should go see a movie later this week and hinted on maybe spending the night again. Before he suggested that I hinted on the “what are we” topic but he kinda brushed it off or maybe he didn’t understand what I meant bc I wasn’t direct. I’m not familiar to dating as I just got out of a long term relationship. Are we just casually dating until things become serious? Do people do this? He wouldn’t suggest going out on actual dates if it was just FWB right?