Hi,
I think we adapt. In general, we are social by evolution, we are wired to "need" other human beings, and according to developed attachments, we may need certain or specific individuals to better function. But, we adapt. If we have good psychological tools we adapt to the loss of significant others sooner or later. I think that there are different levels of needs, and there are different supplies for those needs. Many of those needs are created by culture and we could suppress them, but I think that that suppression could be hard.