Hi Seriously?
It's hard not getting validated for the pain an ex spouse caused and getting breadcrumbs. It shows some level on empathy and I took the apology I got from my ex wife. She simply said "I'm sorry, I didn't mean for things to be this way" and not much more or an explanation - the apology made me angry. I got that apology 5 months ago and I noticed she's been trying to do kind things.
I don't think your obsessing, it may take time to process this. I sent mine a simple message after processing things and simply said "Thanks for the apology, I'm sorry too." The magnitude of her chaos and the apology was difficult to accept and on the other hand I understand the disorder. I think this is the best she can do and I accept that. I said I'm sorry because I understand now I was controlling in the marriage and post-break up.
It could have just been a way for him to say sorry.
It's possible. You can take it for what it is.