Moving on is different from forgetting. You can finally say that you moved on from someone when the pain is over. Thinking of that certain someone often does not always mean that you're still stucked on him. It's just that sometimes, moving on is not about forgetting; it is about removing the pain, love and hatred for that person and learning to forgive the sins he committed to you, while keeping the memories in your heart with peace and contentment.
Moving on means accepting the fact that you and him are not meant for each other. Your love for that person may not have completely vanished yet, but once you've moved on you will be okay with that. However, what you will no longer feel is the hatred nor bitterness within yourself towards that person for whatever he has done. You will be able to forgive him and yourself for not being able to make it. You will no longer question whether or not what you had was real, because you knew it was but that doesn't mean that it has to stay forever. And again, you will be okay with that. You will also wish him happiness for his future endeavors as you take your path towards your own happiness too. Once you realize that what you had with him is a dont-cry-because-it's-over-but-smile-because-it-happened type of relationship, you will be fine. You will be able to continue walking towards this life's journey carrying with you the happy memories and lessons you've leaned from that relationship. And by those things, you will be walking way better and stronger than you did before.
Hi @lorenz20, keep doing good work.