For those that have just gotten out of a long term relationship, they may want to wait before finding someone new. Taking a few months to look at their life may show them where some good changes can be made. This also helps them to clear the way for dating another person without dragging in baggage from their former relationship. There are few people that go through a breakup unscathed. Even if the two part as friends, there are deep feelings of hurt for many.
Many people need to take stock and be clear about their feelings before meeting someone new. Waiting to date gives them the opportunity to stop their previous relationship from interfering with getting to know and accept a new partner. They will have a better chance of being successful in their dating. It may even lead to a lasting long term relationship with the new person.