Every one ever feels happy and sad. They will be sad, when they separate with someone whom they love so much, but don't be sad because it is life that we must face before dying. where there is a meeting, there is a farewell. we must face it calmly and enjoyably without thinking about it too much because it will just waste your time and energy.
Every one will feel it because it has been determined by Allah for all human beings in the world until we meet again in the here after.
saying good bye is not really the last meeting with someone, we can meet again next time. So, we can take a lesson from that farewell.