I hope you don't feel I'm being as unfeeling as a stone, but instead of focusing H's response as a negative, see it as you having tested the WAS waters, and right now, they're not receptive. What does that mean? It means that time and circumstances haven't come together to give you the results you want yet. So what to do with that? Well, don't create these kinds of situations where you may not get the answers you want. But have no expectations and more patience instead. Don't put the issue to him, He's a WAS!!! WASs act notoriously like WASs and his answer wouldn't be unusual for a WAS!
A customer comes into your Widget store where you're a salesperson. You tell them that it would be great for them to buy the XYZ brand widget, but they've had the XYZ brand widget and don't want it. Do you think if you put it forth as a consideration for them that they'll change their mind? Not likely... instead you have to think like the customer does, from their viewpoint.
Right now, your "customer", your WAH, has been hurt by you, doesn't trust you, and living with someone else. That's a lot of obstacles to surmount for him to come back, but not unusual. Unlike you, he hasn't been alone so as to delve inside himself; he's got a human panacea to divert him. Yet, he's told you that, fundamentally, that relationship is a disaster to some degree. It could very well be that it fizzles in time.
Use that time to keep on course with DBing. And one more thought harking back to my last paragraph about understanding his viewpoint: His trust was broken. It needs to have a sense that it can be restored. Words alone can't do that fully. But words can wound. Were my WAW to write me and say anything like, "I'm going to be OK if [reconciling] doesn't happen. I know that I'm fine and my future is bright and truth be told I'm looking forward to a new beginning", then I'd get the impression that she can take or leave it, and that wouldn't sound like commitment to me.
Please don't take that to mean I'm kicking you when you're down.
Be loving. Be understanding of his hurt. Time is needed for any lingering resentment to cool off and things to change.
