I am a girl and if I like a boy and can't stop thinking about him I try to think about somthing else like school or other things. But if u can't sleep because u are thinking about a girl than do something about it like tell her how u can't stop thinking about her or if it is a total secret then maybe just keep thinking about her and it might get better.
an obsession :)
that they cant stop thinking about you, they always wanna be with you.
Maybe Its Love ;)
If you want to stop thinking that you need to make sure you trust her. If you are insecure about yourself and the relationship you will always have doubts. So work on building a strong and honest relationship and all doubts should leave your mind.
yes
Sounds like a mental problem to me.
Take up a sport or hobby. You can stop thinking about her.
you cant do anything men, admit it your in love with her
try and have some fun!
It's called google translate :)
unless he has a new girlfriend you should talk to him.
find a new boyfriend or girlfriend to stop you thinking about them ( your ex )