Ruth's response is both marvelous and ridiculous; it is impossible and true as anything in human life. Orpah said and did what the cultural norms she grew up observing called for. She said, "No no, I'll stay with you," at first. And she said this just as long as form called for, and then she said, "Okay, here let me kiss you goodbye, but don’t smear my mascara.”
That was Orpah, but Ruth "clung" to her mother-in-law. Clung. That's the same word used in GENESIS where it says "a man will cling to his wife and they will become one flesh."