Life is a short ride, my friend.
Don’t presume that there is going to be more time to tell people how much you care about them. Don’t presume you can tell them their friendship, or their work, or their art is important to you tomorrow, because tomorrow isn’t promised to any of us.
Send the text, fire off the e-mail, make the call, go see them on a whim…the medium doesn’t matter.
Just tell them now.