I think it's a mixture of all the above.
My husband and I just share the same sense of humour. We are just on the same wave length.
We have our opposites. His idea of a fun afternoon is going for a long run or bike ride. Whereas mine is to look around a castle or stately home.

I still love him dearly after 18 years of marriage, not sure what the magic recipe is, we just work :)
Resteemed