Well, the cat's out the bag and now the OW knows that he is still married and attending counseling. I'm sure she wasn't a happy camper. Sounds like your h was pretty down in the dumps and drinking to ease his pain and guilt. Don't bring up the texts to him. Just sit quietly and see what transpires in the next few days.
I wouldn't worry too much about the texts as he was in a bar and very unhappy at the time. He may not even remember what he texted you. However, if he is on the path of a divorce, then let him file. Don't do the dirty work for him.
Try to enjoy your weekend and keep the focus on you. I hate to say this...but...your daughter needs to step back and allow things to play out. She does not need to add fuel to the fire right now.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
