If you love someone for a day, week, month or year and then lose interest. You are in lust, not love...If someone looks different, gains/loses weight or has an accident/surgery and it changes their psychical appearance and you are no longer attracted, you were trapped in lust, not love.
For true love is unconditional and you love whether that love is returned or not, loves the person's heart soul and mind and knows that things change like the wind and your ship can change sail with the wind, not turn against it. That love lasts for an eternity, without end.
If you can't love like that, you are in lust, not love and do not call it that for it is an insult to the word.