They should live and remember them 
Occasionally, in the case of elderly couples, when a spouse dies, the other spouse dies right after that. In most of the cases, it is because once one spouse leaves, the other who’s left behind cannot take life alone. If we think about this solely from the perspective of love, if they love their partner so much, they should live and remember them after the loss. That is for the loved ones. However, they cannot do it but choose to die, because they cannot deal with the pain of loss and the loneliness that they must go through.