"Look Marc, I think we need to talk and maybe go somewhere a bit more private, because as you notice my husband is not very happy seeing you here".
"I want to know the truth, Tracy, this isn't a game like we used to play when we first met, remember? You cannot just slip a piece of paper in my hand and then expect me to run behind you all the time".

Follow up:

"You're right, I will tell you everything tomorrow, ok? What time do you finish work?"
"I'm not working tomorrow. Let's meet at the Arcadia for Brunch, 12 am".
"Ok, I'll bring Tessa along, if that's ok with you?"
"Tessa?"
"Yes Marc, your daughter".