I don't want to get schmaltzy or anything, but I don't think love is great proclamations or the buying of expensive jewelry.
I think it is the every day little acts of consideration and warmth...such as...
Making sure the towel warmer is on.
Leaving a heart on a bed you've made.
My dad could never say "I love you" although he would reply "me too" when I said I loved him. However, I knew he loved me when he gave me his green stuff from a baked stuff lobster which he adored as much as I did if not more.
I know my daughter loves me when she comes carrying blueberry muffins from Dunkin' Donuts or sends a cryptoquote book things I can't get in Switzerland or France.
I try and reciprocate with the towel warmer and bringing my husband a treat. I want to make sure he is comfortable with whatever we are doing. I will send my daughter Irn bru every so often when she's been having a difficult period at work or the weather is horrible.
Not big stuff, little stuff.