Weeell... you could substitute cycling with so many other pursuits -angling, football, birdwatching, constructing a replica of Crewe junction in the shed. Sometimes it's healthy for two people to spend time away from each other doing different things, maybe it's even the thing that enables them to tolerate living with each other in later years. More practical than separation, less expensive than divorce. I wonder how many people stick together to the bitter end because they ultimately can't afford to live apart. If you can afford it, splitting up is achievable. For many, they just have to make the best of things somehow. People change and sometimes grow apart. Not everyone finds their soulmate, even if they think they have at first.