I'm not saying to TRUST him. I am saying to ask for proof that he has told her it's over - and ongoing proof that it STAYS over.
I'm just not as cynical as some about the "realness" of his remorse and desire to keep his family. I think what he said and did this weekend is pretty much in line with what is to be expected at this stage. And it is not unusual for them to drag their feet getting that final cutoff notice out to the OW - after all, it makes the WAS look pretty foolish, doesn't it? Even my H dawdled for weeks on sending it, even though he was totally back with me and writing me mushy love notes.
So - I'm just saying, don't let you "protecting" yourself squash what appears to be a genuine chance at reconciliation, Deb. Sure, there's a risk he will waffle the other way and you'll get hurt. But there's an equally great risk that you'll "protect" yourself by being aloof or punitive, and that will drive him away.