So proud of myself and I have to share!

Yesterday, H had an interview right after work, he said it would be about 90 minutes, so in theory, he should have been home by about 730/8. He didn't get home until 10 pm. Normally I would have texted and asked how it went, or when he was coming home. I didn't. I painted my nails, watched a movie and didn't even pause it when he came home.
He initiated a conversation with me, telling me how it went. I didn't ask any follow-up questions and remained detached.
Even when he went to bed, and normally I would go at the same time, I finished my movie and then went to bed.

I'm really struggling with the not engaging him in conversation. I know it's persuing, and not detaching, but it feels so cold.
On the flip side, he is asking me for a separation which is also cold.