I Hate it When... I haven't noticed noticed a before and

 I Hate it When...
I haven't noticed noticed a before and out of no where i see him looking at me at times or being close to me. I'll brush it off and think it was nothing but then I'll start to notice it more often. Next thing i know, i'm thinking this kid actually does likes me and i'll start noticing cute things about him and start liking him back. And just when i think he really does have a crush on me, I'll find out that he just asked another girl out or likes another girl. Meanwhile, I haven't even talked to him. 

Probably the worst at reading people =/