It is probably impossible to love any human being simply 'too much.' We may love him too much in proportion to our love for God; but it is the smallness of our love for God, not the greatness of our love for the man, that constitutes the inordinacy.
But even this must be refined upon. Otherwise we shall trouble some who are very much on the right road but alarmed because they cannot feel towards God so warm a sensible emotion as they feel for the earthly Beloved. It is much to be wished--at least I think so--that we all, at all times, could. We must pray that this gift should be given us. But the question whether we are loving God or the earthly Beloved "more" is not, so far as concerns our Christian duty, a question about the comparative intensity of the two feelings. The real question is, which (when the alternative comes) do you serve, or choose, to put first? To which claim does your will, in the last resort, yield?
CS Lewis, The Four Loves