How to start a crush

im a guy btw

what I have found is that if I think or know that a girl likes me I either
1 am not interested and stay away
2 or I begin to like her back

It is a weird mental thing I have noticed not only with me but other friends as well.

GIRLS have your friends tip the guy off either "accidentally" or intentionally

GUYS im not sure if this works for the girl, one thing I know, nothing gets done by admiring from afar!