At age 5 if they like u they hit u.
At age 10 they hit u and pull your hair.
At age 13 when u return their affection they tell all of their friends which makes u look bad.
At age 16 they tell u that u r special when they r really dating several other girls.
At age 19 + there's more of the same.

Comments
I am not sad about it, but it's just an observation ; )
B
I kinda like the second one ; )
B