You should be honest with this boy about how you feel. If there's no chemistry, then don't stress! Theres plenty of guys out there :) you'll find love again ;D
well i think the guy who's a year older is just maybe a little shy or something when he wants to see you... i dont know who you like of the 3 guys but i also think that maybe the guy you had your first kiss with is also too shy to admit that he likes you... or he may have moved on. Hope it helped a bit :)