This may be considered a "touchy feely" topic and I can picture many a man wincing at entertaining the thought.
Anyway, you ever love someone yet sense that you're values and lifestyles are too different to make it work in the long term? It's a sad kind of realization isn't it? Common conflicts are so painful when you really pause and reflect upon them. Better to keep you're nose to the ground and deal with your routine right? Damn!