I think you're doing very well. Don't beat yourself up about noticing other women. You're detaching. You're moving on. That's natural. You're not the one who wanted to nuke the marriage, your WW did that. Next time you exchange smiles with this woman, exchange pleasantries too. A time or two after that, ask her to lunch. Lunch is a much less "serious" date. It's like it's a date, but it isn't. You're detaching/moving on, remember? Don't just say it. Do it.
