I like this guy that I'm friends with

I fell for this guy who I'm friends with & met over the summer. He is so great to talk to one on one but in a group he acts cocky. So tonight we went out with a few people and he bought me a few drinks & would put his hands on my waist & stuff. As well, we would flirt. But, I notice he will flirt with my other friends too, it's weird. I've heard he's insecure, but should I even waste my time on him? I do like him a lot but I think he would laugh it off if I told him :/