I went to college with a guy that has been a fairly good friend for quite a number of years. We keep in touch regularly. He played in the fantasy football league that I ran for eight years. He lives pretty close by. We met his girlfriend, who later became his wife, and we felt like we might have the option of developing a good friendship with this couple. They were fun and friendly, and when they started their family not too long after ours, it seemed even more of a potential match since having the kids play together is always a good catalyst for family friendships.
Unfortunately it hasn’t really worked out as we might have thought.
We still get together with them and see them socially, but that closer friendship hasn’t really developed. And, it’s all because of the habits coming down to the couple saying thank you.