Why do breakups take up all of your time and space in your mind?

I feel like all I do is think about the break up. When I’m at work, when I leave work, when I’m driving, when I’m going out with friends, when I’m doing the laundry, before I go to bed, when I wake up. All day, every fucking day.

I need this to stop, and I know people suggest I just keep myself busy but I am busy and occupied yet it always finds a way back into my mind. Is this what healing feels like? If so, does it get better?

I also can’t stop thinking about the start when we were happy and excited and it was all good, and I can’t imagine having that experience with anyone else ever again because I remember the anxiety of it all and I just don’t think I want to put myself through that again.

I should’ve just put this in a journal but I was hoping to get some insight or positive affirmation or anything really.