Unless he calls off, you should go. Probably even if he does.

Stop texting him about it. He told you and his Mom he was coming.

I didn't realize you both have been together so long. I always suspect MLC in these long term marriage/relationships when one suddenly wants out.

Tell the grown up kids everything. They will find out soon enough.

M: A really long time.
Crisis: 5 years.
She's still worth it.

Life is never made unbearable by circumstances, but only by lack of meaning and purpose. -Viktor Frankl