It’s hard to move on from things that didn’t end with proper closures, especially when it mattered to you.
Never let things that matter to you pass no matter how insignificant it may be to others. Don’t let something that hurt you slip through to history when you haven’t gotten the proper closure and outcome you deserve. If you really want to move on, you should seek the answer that you deserve.
Ignoring and trying not to think about it doesn’t help.