For the second type of relation, we do expect LOVE and affection from others. There might be a scenario where we could not display our love and that resulting in the obstacles in the relation, but in such situations, the affection we have towards the other being has to overcome the ego in us, that is the real LOVE and which adds to the relation. The day ego overcomes the affection, problems start and that lead to a very bad experience.
We come across the first type of relations very rarely, most of the relations are parents-children etc., which cannot be described, they are meant to be there.
The second type of relations are to satisfy our ego, and the same ego interrupts the relation when it could not accept it, there comes the fight between the ego and love towards the person, if ego wins, the relation ends and if the love wins over ego, the relation perishes.