As usual, my metal family comes through for me. Thank you all for helping me to feel better.

We've since had a long talk about the day. I basically ignored him for the rest of Sunday, took kids out and had a good day with them. When they were in bed we had a real heart to heart and he apologized.
He stopped short of admitting that he doesn't like the fact that he's getting older.
What I don't understand is that he's in great shape ( I will not even say great shape for his age: he's in great shape period!) looks after himself and has a very  healthy lifestyle so I have no idea what the mood swings are for.

He has apologized though and says he'll make it up to me so we'll see how things go.