How to proceed with angry, almost-walkaway H?

[MrBond]

"Help! H just gave me the "I can't do this anymore. I want to move out" speech. He said despite my changes he does not feel the "spark" and it's awkward to still stay together when he doesn't have feelings for me. What do I do next?"

Of course he doesn't have any feelings for you. He's "in love" with OW. Right now just give him to her. That's what he wants.

"I think it surprised him that I was calm throughout and told him that I understand and support his decision."

Don't ever say that you support his decision. YOu know it's wrong and it's not what validation is all about. You "understand" that he has a right to feel the way he does, but YOU don't have to support it.

"Just know that I see many options for us, but if you think this is the only way, I support you."

Again, stop saying that you support his bad decision. He has to understand that it is all on him. If you keep saying you support him it makes it sound like he's free to do whatever he wants to because you "support" him.

-" I asked to be treated with respect from now on b/c I'm hurt by his behaviour the past month (mean and cold). He apologised and said ok."

Next time don't "ask". Flat out tell him that you will be treated with respect.

"- Finally, I asked if he's still in contact with OW. That's when he raised his voice and said "No, I'm not. I knew you'd mention her. Do you have proof!?" Although I was very tempted to confront him with all the evidence I have, I didn't push it and walked away. "

You should have told him "yes I do" and then walk away.