The original production had different dialogue for each possible combination of lovers, and all of those are in the published libretto (which, admittedly, can be hard to pin down these days). However, the current licensed version no longer includes all those variations, and instead says:
"SHE: My darling! Our attraction is unavoidable!
HE: MY dearest! At last we can admit our feeling for one another!
(ad lib suited to characters involved)"
Personally, comparing them, I find this standard, nondescript dialogue funnier as it gives the actors more to play against and makes the naughtier pairings (Helena/Neville, Puffer/Deputy, etc.) feel all the more subversive and like they weren't meant to happen.