Do you feel resentful that he reached out to you for emotional support? 1.5 years after my Ex left, mine has started reaching out in late night texts (her anxieties regarding the kids). This was after it took me the better part of a year of asserting boundaries (which we alone control) for it to die down. Recent events have re-triggered her anxieties, and I'm falling into the dynamic of soothing. OM/her new husband doesn't always help. I know her better, and she knows what she can get from me. Still, I've passed on a few things I've learned here.
I got a simple text last night. I knew what triggered it based upon a previous text convo 4 hours previously... .I asked, "do you feel anxious?" She responded by saying that she was and she didn't like to see the kids hurt, but that she knew I wasn't responsible for her feelings.

(D3 had an unexplained cut/tear on a finger. It only required a bandaid, but I sent her a pic to document so I didn't get queried the following day. That triggered her.)
I'd take what he said at the end as a positive sign. I validate the positive whenever my gut tells me it will help.