Try not to blame yourself. Sounds like you're both frustrated and he's exhausted. You both need to find some way of reconnecting. Maybe schedule an hour or so to go to a coffee shop together once a week until he has more time.

With him being so busy I think he's reacting. I got very snappy to those around me when I had to work long hrs.

Im sorry you're going thru this. Big s. Our thoughts are with you