She's put you in a tough position because if you say yes that's fine and she sends the letter with that line then you're lying to him. If I were you I would say whatever communication you have with him is your decision. So if you do decide to talk to him about your views on marriage I'd rather not know.
Now whether it's a good idea for a friend to tell a WAS that they may be acting hasty is a whole other kettle of fish. In my situation I wasn't listening to anyone. But everyone is different.
