Boyfriend moody about in car....?

i'm staying at my boyfriend's grandparent's house in the countryside for some family gathering.. and me and my boyfriend never get any private time alone.. so we went out for a drive in his car... anyway he stopped driving and parked up in this little secluded area and started to make out. and when he tried to have i said no and now he's been really moody and hardly talking to me. should i have said yh and how can i stop him being moody now?