There are times when life drives a couple in opposite directions, and they may choose to get a separation or divorce. Their issues could be fundamental, or they might consist of a large difference of opinion on a particular subject. For those couples truly in love, reuniting with a partner might be successful. They will have to find ways to compromise or set aside their differences, but it can be done if they are willing to work at keeping their relationship.
A lifetime of happiness with another person is mostly what attracts people to commit to a long term relationship, but there are few guarantees life will provide them with nothing more than the ability to be happy together. A tragedy that affects both of them could drive them apart, or they might suddenly discover they think differently on an important topic. Taking a relationship break so they can rationally deal with their issues could be the answer for both of them.
There are many couples who have gone through trial separations, and they often find it is a good way to settle their differences. Living together until those differences can be worked out might create too much friction, and the emotional toll may send them heading in opposite directions. Getting back together after living apart for even a short while could make them appreciate their relationship more, but it could also help them settle their issues in their own mind.
Many have been the times when people were too close to an issue to be able to look at it rationally, and space and time can be helpful. For committed couples, it can often be a time when they leave each other to straighten out their own lives, thoughts, and feelings. Being able to understand their own life as a person could give them the strength to commit to their partner once more.