feeling a little used

So I met this guy at my birthday bash at this bar and we hit it off great and went on a few dates but when we started having sex the dates stopped and it just became us hooking up on the weekends after we got done having drinks with all our friends then he just kinda falls off the radar for a few weeks but when he returns he acts like nothing has changed and when he asked if I wanted to come over After the usually drinks I said no but he quickly found someone else to take home now I just feel like a used rag thrown away and it sucks because I was really into him ,anyone has advice how to stop thinking about a fuckboy