Test of reasonableness*

If a couple are married or co-habiting then should they act like a couple or act like a couple of individuals?

Let me give you a scenario.

If my husband wanted to go for a four hour bike ride on a Sunday morning, which of the following courses of action should he follow?
a) check with me that I don't mind
b) tell me that he's going without asking
c) just go and leave a note

I don't think this is a difficult quandry but let me give you a different scenario.

My husband knows that if he asks me if he can go for a bike ride, I'll likely say no because we've already arranged to go to the park with the children. He still wants to go for the bike ride. Which of the following should he do?
a) check with me that I don't mind
b) tell me that he's going without asking
c) just go and leave a note
d) tell me he has to go into work, but secretly go for the bike ride

I tend to think there is a test of reasonableness and that test runs along the lines of 'do unto others as you would have them do to you'.

But what would you do?

*any resemblance to any persons living is entirely coincidental (or similar caveat)