Consciousness of Change in People and Relationships

I wonder if anyone would like to talk about the time in their relationship when you are conscious of a slow removal or erosion of possibly the things that brought you together. When living , working and having children , the dynamic of relationships alter in quite subtle ways. Have any readers been conscious of those moments and what they did about it. The forum lists many stories of affairs , divorces, strange nights out in Wanchai etc , but I would like to hear about how people may have recognized the slow deterioration of a relationship and how they dealt with it. Some situations may warrant a divorce , some had an affair and it worked or did not work for them (man and woman) , some talked it over with or without counseling or additional support and some maybe ignored it and still live with the results of that decision for better or worse.