Say no. NO. Just no. That's nice, thank you very much, but I'm not interested.
Reasons:
1) You broke up. That doesn't happen for no reason.
2) She's married. Married. As in, adultery. It's actually illegal, did you know that?
3) You'd be the "other guy." Eww...don't do it.
4) As much fun as it would be to get back up and do a little dance and what not, imagine the drama. Do you need that headache?
Trust me, just say no.