It's very difficult to distinguish between Love and Lust.
However, simplifying the equation as much as possible, what I personally have learned across 40+ years of life:
Love means that you want the subject of your affection to be happy, even if you aren't enjoying that happiness with them.
Love means that you respect the thoughts and opinions of a counterpart to the extent that you no longer feel the need 'to be right', but that, instead, you just wish the most efficient outcome; including, if necessary, the evolution of child care services to the point where this sort of a perfect example is something that people can adapt to, learn from, and come out more equipped to deal with "real life" on the opposite side.
Sadly, that sort of education has been rare lately....