Proverbs 12:10 A righteous man regards the life of his animal, But the tender mercies of the wicked are cruel.
Love is expressed in your whole life and not just in front of the one you profess to love. It is easy to spot someone who does love like Christ wants us to love because they are the ones showing love to those others are mistreating.
Equally the so called love that a cruel person shows is nothing more than a sham!
God wants us to open our hearts and love with everything we have and not just for the moment.
Show you love openly, not your lust.