You should tell them before physically meeting them and let them avoid going further if it bothers them (which it might -- I'd be worried you weren't "over" your ex).

What will your answer be to the question "Why aren't you divorced yet"?

Me: 46
W: 44
Married: 17
Together 21
D13; S10
BD: 03.03.15 (Not attracted to you)
Almost 2 years trying, alone, to save marriage
Status now: Divorced (effective 06.13.17)