Your H actually discussed his interest in OW1 with you? And you ask whether you can live up to her in his eyes? What about him living up to the concept of being committed and learning to be a H?
I am really floored that he could discuss OW1 with you and the fact that he would pursue her if her marriage doesn't work out. That it might be worth it to give up OW2 for OW1? That is wrong on so many levels that I don't even know where to start.