I have a lot of empathy for a woman whose husband came out as gay recently and left her for a man. I can’t imagine what she must have been through but she has stayed on great terms with him. Parenting together and building a friendship. His kids have adapted. I fully support him. You only get one life, and people break up all the time.
I think that’s the right approach to take. Why shouldn’t they be happy and loved up? If their (I assume adult) DC won’t speak to them that doesn’t mean they don’t deserve to be happy.
Yes, I’d feel like the relationship was a sham if they said they were 100% gay and not bi, and that’s sad for their husband but as an outsider I wouldn’t judge them because once they realised they were gay it is 100% right that they leave. People leave for all kinds of reasons