I can't stop thinking about him or her. What should I do?

Learn to accept it. Everywhere heart broken or made changes us a little. Embrace the good memories. Accept the mistakes that had been made. Evolve yourself. Make something special for you today Cause its not the end of the world andyou deserve better. :)

Get out with friends, go out to the mall, listen to music, draw, write, talk to friends, hangout with your family. do stuff that'll take your mind off of him or her. and if that stuff doesn't help then take a nap go for a walk a run play outside

Think about which moment you stop thinking about him/her. Then exploit those moments. But that's only temporary solution. If your can't stop then confess your feeling (again) then you have to stop if it doesn't work.

Write down all your thoughts about that person, otherwise you'll keep thinking about the same stuff. Try to be busy with other activities as much as you can, even when you don't feel like it.

You should tell him or her that you are doing this. If you have feelings for that person, feel free to mention that as well. If that person has a crush, you should just drop signals that you have feelings for this person and hope for the better.

You can make yourself busy in other things which you like the most or spend time with friends and family. Doing things which you like can help you diverting your mind

Organize your ideas and think "is he/she really worth it?" then think if she/him could make you really happy. Talk to that person about how you feel, maybe that person feels the same about you.

Try to do something that makes you think more positively and listen to some music. Relax or go to bed and sleep.

Yeah...it would be surely hard to avoid the thought of 'that' person...but we must understand that human mind is crazy....if we say NO to a thought it will surely come and occupy our mind entirely.....so whenever we want to avoid the thought of a person the single solution is - ALLOW THE THOUGHT....and carefully and serenly observe it.....as time passes the thought will slowly subside.....dears.....it is based on my experience. ...you can boldly try it....all the best!!!!

Use a 7 Cups calming program to help settle your nerves. Then, when you feel it's best, approach them about your feelings.