This song isn't all about love being lost and their the best part of you its also about trying to get bak on your feet and getting over it even tough it hurts. So if you see them and their happy then get happy. You shouldnt be the one sufferring so stop waiting for them to come back cuz even if they do they don't deserve you. This is for all the people whove had their hearts broken and are waiting for the person to come back because really even though they were the best part of you, theres tons more just waiting to be discovered and fill that hole that they left.