When H and I split a few years back, I treated him as a companion. Family things with the kids? Yes. Saying please and thank you? Yes. Mentioning the weather? Yes. Commenting on liking a shirt? Yes. Just like I would tell a male coworker- Nice tie! or Good job on the project. Or Thanks for helping. Share emotions? nope. Mention issues with mom? Nope. Ask for help with mowing the lawn? Nope. Ask for a recommendation on a car mechanic- yes. That's how I treated H.