Do guys forget their "crush" easily?

Anonymous
I know there's a similar question, sorry :(
So..
1) He was a senior and I was a sophomore, we never really talked, but he stared... a lot. And his friends, every time we met on the hallway let's say, they'll start calling his name, or smiling or punching him or whatever.
He kinda acted nervous, like at the point where you can notice
Sometimes he blushed
Sometimes he smiled at me
Could that mean he felt something? I never really assured myself, and I couldn't convince myself (low self-esteem problems :()
2) If he liked me, will he... forget about me now that he graduated and won't be on school anymore?
3) Everything started when I was a freshman (he a junior)... why didn't he talk to me on more than a year? :C could he have been just making fun of me or something?
Do guys forget their "crush" easily?
3 Opinion