I was a bully . The past keeps haunting me even though I apologized. What should I do?

if it's other people that keep bringing it up- just prove them you have changed. and before you can really change you need to let it go yourself

Sometimes as people, we punish ourselves for what we've done in the past, whether it's said or done something wrong, doubted yourself or bullied others. Nonetheless, we forget to forgive ourselves in many scenarios.

Forgive yourself, you have shown remorse for the rhings you have said or done don't ruin your future by living in the past. You're a different person now. Love yourself and others will follow. Self love is the key to a happy future

Accept the past, it happened, it won't change. What matters is the future. You apologized, that's the first step, now you need to accept yourself. What you did was wrong, but you can still make a difference. You can volunteer for bully prevention programs if you wish, or just share the negativity received from bullying with others to try and prevent it!

Meditate. I encourage you to listen to a few tracks of 7 cups to relax you.https://www.7cups.com/exercises/mindfulness/?showlist=1

you should forgive yourself, If you feel bad about past actions it means you have somehow changed. Also, since you have even apologized, you have made amendments ! This is very good. Just move on !

prove to the person that you truly are sorry. sometime just "sorry" doesn't help. hope this helps.