10 ways on how to move on from your greatest regret:
1: cry your heart out, until you can't cry anymore. Until there's no tears left.
2: accept that you can't turn back to the past and make it all right again.
3: accept that he/she will never comeback. That everything will never be as the same as it use to be.
4: focus on everything that is still there, the people that never left. Appreciate them.
5: don't force yourself to move on. Give yourself a time to think about the past let the memories linger on your mind until you can accept everything is gone.
6: focus on yourself, on picking yourself up and learn from every decision you've made and what made who you are today.
7: embrace yourself, your every flaw and your regrets embrace everything that will make you a better person.
8: think of the regrets you've had as a lesson as a memory that you could learn from.
9: stop thinking of "what if's" and "what was" instead think of "what will" and embrace it positively.
10: lastly, regrets let us realize that we are human, we commit mistakes and learn from it. You can't stop regretting you just have to keep on trying and you'll get over it.