Was he flirting or just being friendly?

Recently I went to party were I meet this guy and I thought he was interested in me but I dunno if I just saw what I wanted. I know him through mutual friends we always see each other just at social gatherings. This last gathering right before I left he sort of caught me and asked me how I was doing and we had casual conversation. Then he asked if I was going to this Halloween party that again we always see each other at every year and I said I was. He then goes on to say that he and his friends are going as this sort of comical characters (I dunno how to explain but basically you would look like kinda unattractive) he said “I’d asking you to dress up with us but you know your way too pretty to pull it off ” it just felt like he was showing interest in knowing me and implying that he found me attractive. So later that week I asked my friend if she could ask him if he’s okay with her giving me his number because I regret not getting it at the party and he’s said that he can’t give me his number because there is another girl…I just don’t understand why he was the first to imitate a conversation and show interest if he’s talking to someone else or did I just mistake what he was saying and he was just being friendly. What do you guys think was he flirting with me or just being friendly?