The answer to your question is because he is a sick piece of crap right now.
And I don't mean literally sick.
But you knew this already.
Two PA's while separated?
I just read about your great trip to Costa Rica, so I completely understand why this would be devastating. I will say that from my perspective, the man is still in la la land as regards what exactly his future plans are.
You regroup. Take a step back. Think about your ultimate goal, realize that this is yet another example of the mess he has generally been making of his and your lives, and figure out how you get it back together.
Trust already needs to be restored. This is yet another one for him to eventually atone for.
As Jeff said, breathe.
In the heat of this moment, you don't want to make any decisions regarding your desire to continue trying or not. Give it a day or so at least.
Then realize that only you can decide when you've had enough. For some strange reason, I don't think you're there yet.
Blessings,
Bill
"Don't tell me the sky is the limit when there are footprints on the moon."