Hi and welcome. I'm glad you are in a stable place at this time.

I guess in life sometimes we have to accept that we may never know the full reasons why things happen.
To be honest it sounds like you both were not in the best of places at the time and both closed down to protect yourselves. We all do it to some extent....I completely withdraw when I'm hurt, even from those who love me the most.
Sometimes we have to just draw a line, accept , learn from it and move on.
Easier said than done but only you can decide if its something you need to keep going over looking for an answer that may not be there or whether to accept you were probably both upset and give your brain a bit of peace about it.