My dude, stop using the word “dom” to beat yourself up.
You’re a fucking human being. A relationship just ended, you are absolutely expected to be hurt and upset.
People need to stop pretending that D/s exists on some ethereal other plane that transcends human emotions. You’re still a person first. Your partner left, and you are sad.
Wether or not you like to top is irrelevant. Have some ice cream, watch some good TV, and be forgiving of yourself.