Have you tried asking him what talking to her does make him feel? why he particularly likes talking to her? Does it remind him of his youth?

It would be interesting to know why he likes talking to her, and why SO much. You could say to him that you are confused as to why you feel it inappropriate but you do. Try exploring this issue as an exercise in observing/ exploring feelings as opposed to accusing one another. A bit like a debate.

saffie

Saffie
me 46
H 46
M in 1986
D20,D18,S16,D13
H's A 01/05 to 07/06
H recommitted to M 07/06
renewed vows 09/06
Going from strength to strength