If you expect people to be nice, you should be nice.
Similarly, if you love the fact that people are being appreciative towards you, than you equally should show some appreciation to people.
Appreciation doesn't just come in words. One can say all the sweet nothing, repetitively. However, if in reality the action is just other wise, the words do not mean anything. Nothing. Zilch.
Remember that action speaks louder than words. Your effort means so much more than your words.
Know that your effort in knowing, effort in showing interest, effort in taking time to text, effort in trying to understand, and effort in explaining mean so much more than your words of saying:
"I appreciate you."
"I love you."