Since you said "you and your spouse" it actually would be a divorce rather than a breakup. It would have had to be something really bad in the eyes of a least one of you in order to consider taking legal action to file for a divorce.
Normally it's a "deal breaker" such as cheating, physical abuse, constant verbal abuse, neglect of affection, drug/alcohol addiction and so on.
Generally speaking someone would have to be very unhappy to bring up the "D" word in a marriage.
I suspect in order to come close to having the same feelings there would have to be some major changes otherwise if there are none it doesn't make sense to stay together. Whatever caused the friction will rise up again.
If both people really do feel as though they are still "in love" and don't want to be with other people then it might be worthwhile to seek couple's therapy.
This would allow both sides to get their gripes out in the open in a controlled environment where compromises may be established.
Having said that most couples seek therapy when it's too late. By that I mean one or both of them has already fallen out of love.
If someone is not "emotionally invested" in the marriage it's just a matter of counting down the days until they decide to leave.
Emotional divorce happens long before the paper divorce is filed.