Greeks knew better about the subject of  L O V  E . They did not single out the only kind of love that can be, and often is, genuinely unconditional. Asking nothing in return and sometimes getting nothing in return and which is unquestionably a virtue.
The point is, there is no consistency between the chemistry and poetry of the best emotion we know.. L O V E , that promotes trust between individuals and it would be foolish to say that trust is less valuable.