Why can't I get over her or him?

It is possible that you are holding on to an ex partner because of shared memories together, and thinking about that person may trigger thinking about good times.

When you have been in a relationship that was meaningful to you, it's normal to be hurt when it's over. Only time will heal unfortunately, but it's a good thing you take the time to mourn.

It can be difficult to get over someone you're attached to, I suggest cutting contact with them, at least for the time being, so you can learn how to breathe without them by your side. Dr. Seuss always says "Don't cry because it's over, smile because it happened".

If you can’t get over someone, it’s because you are not accepting the pain that they are gone. Not accepting this painful event will lead to suffering and an inability to move on.

It's hard to get over someone that you really really like or even love and it just shows that you really cared for that person so it's going to be a little harder for you to get over that person

You may have something you still want to say to him/her (reffering to her from here :) ) or there may be something you haven´t been able to accept (like the fact that it is over/you can´t get her). The best thing is to say everything there is left to say and then try to distract yourself with hobbys and friends. Also maybe try meditating if that fits you. That can also help you with getting all the thoughts about her out of your head :)

Moving on takes time. You have to concentrate on present and not think about the past. You need to accept the reality that he no longer loves you.

This is a question that only you yourself have the answer to. We all have different situations and our feelings and emotions are not the same. For example you may not be able to get over them because you love and miss them. Someone else may not be able to get over their former partner because they are afraid to be alone. We all have different reasons for not being able to get over someone.

In my personal experience, distance is the best method. Take your time to be away from them, and free yourself to start new, good habits.

Totally different for everyone. For me, I realized I couldn't get over someone because I didn't respect myself. Once I realized I could be independent, it was easier to move on.