The issues, like the couples, are many and varied. Similarly, the solution for one couple may be very different to that for another. The solution for one couple may be to reconnect, for another to separate well.
 
Relationships may be heterosexual or homosexual, married or de-facto, current or past.
 
Couples may wrestle with small and/or large differences but unless the issues are resolved they can fester and grow. If addressed and resolved in time, the relationship may flourish.