Love comes and goes frequently, so it is important for the people to spend time realizing if they are in love with their spouse. Often times, people are too quick to get divorced or separated instead of working things out.
However, people do fall out of love with their spouses. That is not uncommon. However, people need to make sure. Divorce should only be done if the two sides are absolutely sure.
There may be times when one spouse falls out of love temporarily with their spouse. This means that they are not in love with their spouse for a short period of time, but they are not aware that it is temporary. So, yes you should divorce if you are not in love anymore but only if you are sure.