Boy Advice.. idk what to do

This guy I work with has been flirting with me and I don’t mind it, he’s cute. We were talking the other day and I said that nobody likes me and he said that’s not true you’re very pretty and he said that in front of all of his friends. He was also very happy when I said I didn’t have a boyfriend because he thought I had one. He now seems to be flirting with me more after I told him I didn’t have one. Then he messaged me last night and we were talking for a while and he sent me something joking around about how I’m “ms. perfect” and I replied that I’m far from perfect and he said close enough. I don’t really know what that means! I’m guessing he was being flirty but I’m not very good at realizing someone is flirting with me. Any advice or comments about it??