Gilly Darlin' my heart goes out to you. I'd say the most important thing is just to be there for them. Don't place blame or choose sides. Sometimes nobody is to blame shit just happens. I know it isn't a lot but my prayers and thoughts are with you. Been there myself a few times. Hugs.

__________________
As to marriage or celibacy, let a man take which course he will. He will be sure to repent - Socrates

Love is not looking in each other's eyes, but looking together in the same direction - Antoine De Saint-Exupery