Why do I wake up thinking about my ex?

Because you still love them and it's something that you can't easily get over because of the love you two once shared :)

You wake up thinking about your ex because your used to have him or her in bed with you right next to you. Your used to having there arm wrapped around you.

because you miss him or her or they pop up on your mind and maybe your wondering how they are in life

This is a normal response to breaking up iwth someone. It isnt your fault. Figure out a way to distract yourself, e.g. drawing

Sometimes, it's hard to let go of someone who played a major part in your life. It is not easy to forget the memories, let alone pretend like they never happpened in the first place. Give yourself some time, and know that this person helped you grow. Be thankful for that, and try to remember them in a good way. Steer clear from any hard feelings/regret, try instead to be thankful for them and the memories you share. Hope this helped :)

You wake up thinking about your ex because that person has played a huge part in your life and has once been someone very important to you and might still be important now, as they have been with you before.

You find it really hard to let go the people that you care about. This is normal and shows that you are a passionate and loving person.

You remember something good you guys did together or you dreams about him /her or maybe that person is thinking of you

I would personally wake up thinking about my ex because I missed all of his good characteristics. I know that an ex is an ex for a reason, but still. I didn't like the fact that someone is going to possibly experience a better side of him. And actually work out. I felt like I lost.

Maybe you still have feelings for them or an unresolved issue. Sometimes we regret our decision and that regret takes over our minds and it's all we can think about. They are an ex for a reason remind yourself of this reason . If you still feel the same maybe reach out to them