Lol cure-kun is a veteran on this lol.
Anyways, it's easy to tell when guys like a girl. Mostly discussed here are true but it's different for individuals, a shy person like cure-kun and I would actually avoid her for Some reason.... But the thing about looking at the girl is true. Sometimes the guy doesn even know why he likes the girl ( like me, I rly don't know why i like this girl I know) . Hmm what else... But there's one major point that would give you highest chance that a guy likes you. It's when the guys start giving you something, small or big. When the guys gives you flowers, definitely.
... Valentines is coming up...