"We" language

My friend's birthday was coming up. She was going to make plans for a few couples to go out to dinner at the Melting Pot to celebrate. She was talking and said that we would love you guys to come. She was talking about "we" as in her and her husband, even though her husband had no idea about these plans until she was talking to me about them. She asked if "we" as in Adam and I would be interested in going. I took it upon myself without asking him, to say that we would love to go. He was with us that night but was not paying attention to the conversation. When I reminded him of it a few days later, he said that he knew nothing about it. Since I never checked with him, I think this would be an example of where a "we" statement should not have been used, unless I consulted with him first and made sure he was able to come with.
I was lucky in this case that he could go so that I didn't have to break the plans that I made for the two of us. Next time, I will make sure that if I do make a "we" statement that I make sure that WE both agree!