Shodan, I agree that it appears that things are moving in a positive direction, however it appears to me that you're in that 'things could go either way' spot. I would rely on your DB coach (I think you mentioned having one) for guidance on how to proceed, but have you and W discussed MC at all?

My only advice would be to tread carefully at this point. Looks like you've managed to start re-attracting W, but be careful not to scare her off. I echo Toot's advice as far as W admitting to an A/ providing transparency- that's something that only you can decide is a deal breaker or not. What if she never admits to anything more than a friendship- does that matter to you?