My apologies for not knowing your story...But IMO you should not put yourself in a position to have guys hit on you right now.
From your registration date, you are very new to this mess. You need to focus on your marriage for now - no matter which way it turns out. That's enough to deal with without dragging an innocent bystander into the chaos. In the early stages it is very easy to say FTG and start looking. Hell, that's basically what he did, right? But do you really want to compromise yourself like that?
Go read the Madhatters threads. There are lots of people there that will tell you that 2 wrongs do not make a right.
Either divorce your husband and date freely after the papers are signed or stay committed to your husband and work on your marriage. Ultimately, the choice is yours.
Didn't you expect that same courtesy from your WH prior to his A? Do you want to be like him?