What should I do??

Right myself and this boy have been on and off for a few years when I say this I mean the past two Decembers and the other day we were just talking because I thought we were just friends he messaged me asking if we should try again if you asked me last week if I fancied him I would have said no and didn’t have to think about it but he has this way of making really liking him I wouldn’t says he’s fit but you know it confuses me because I have this best friend who is a boy and my whole friendship groups say they can tell I fancy him but I swear to god I don’t so now I don’t know what to do I don’t want to tell any of my friends but I want some advice xx