I can't stop thinking about my ex. What should I do?

Try to distract yourself, start working on your hobbies or hang out with your friends if you'd like.

Be honest with yourself. No one is asking you to delete him for good from your life. But keep in mind the reason why you two broke up and think about what makes you happy. Is he making you happy? Is he making you sad? You're holding the answer.

Sometimes when you can't think about someone, it's best to give it some thoughts. Reflect on your relationship and get some closure before moving on completely. Afterwards, you can then concentrate on yourself. Go hang out and focus on other aspects of your life - family/friends/pet - you'll be surprised by how much you've missed. Find yourself and remember that someone else will come along and make you much more happy than he could ever do.

Firstly, take a deep breath! Try meditation or find another activity that calms you down or is soothing to you. Exercise is a good way to boost your mood. It releases mood enhancing chemicals in your brain. It doesn't have to be strenuous. Even a walk around the block triggers these chemicals.

Based on personal experiences, keep yourself busy! hang out with friends, family, play games, etc. depending on the reason for the break up you could also try talking to him about it. Atleast you'd have the peace of mind to know you tried. Keep yourself safe and dont try to go into a relationship if it was unhealthy before. Put yourself first!!!

It always helped me to ask myself why I think of them- has it really to do with them or is it something I projected on them or even something I missed about myself how I was when I was with them. Don't try to fight the thoughts, they are okay and are there for a reason. For me, accepting those thoughts, but not chasing them helped me a lot.

Start thinking about something else other than them. I know it may seem hard but that would be the first step.

Well, we all have a past to be more precise 'a bad past' and it wasn't that bad when we were living those days. Back then it was something we wanted and never thought we would hate it so much in future that we want it to remove from our hearts and brains, yes we never we would want to forget it. That's why its hard to forget out past. And to really forget it you need to make new memories new happy moments, try to accept what happened in past, try to convince yourself that past is gone and you can not do anything about it, all you can do is to move forward, give your life a new turn and live it to the fullest. Like is too short to think about ex boyfriend/girlfriend. They are your ex for a reason and keep the reason in mind and accept it. Good luck :)

He is your ex for a reason. You should sit down and tell yourself why it didn't work out. This will refresh your memory about you two not being together anymore.

Personally for me, I try to get a rebound to help me forget and invest into something you're passionate about.