I am a late bloomer Autistic woman, could me getting back with my old boyfriend be a fixation ?

So a little background, I have dated a boy for a long time and then we took a break because of mistakes I made and I'm just going to be honest me not being a great boyfriend.

I have wanted to get back together with him so bad I have thought about it and what I want to say to hi and mapped out conversations in my head with him thought about how I will say sorry and make it right.

Everyone literally everyone says just move on just move on but no I want to make it right and make it work.

Could this be an Autistic fixation.