Yeah ....you're right ...that pretty clear.
Why are they getting a divorce if they want this relationship?
Did this start as some swinging experiment or threesome?
It seems incongruent to place such a condition on a new partner while he's getting a divorce from that person.
I could understand respect, acceptance, being cordial and nice ....but loving support seems a lttile far....to me.
Has he demanded the same from her ...towards you ?