She’s probably just seeking “societal affirmation” for her crowd’s inability to make a commitment and stick with it.
She has also confused “falling in love” (i.e. getting smacked up the side of the head by emotion - Cupid’s arrow), which can ebb and flow, with real love.
As in “Love is patient, love is kind. It does not envy, it does not boast, it is not proud. It does not dishonor others, it is not self-seeking, it is not easily angered, it keeps no record of wrongs. Love does not delight in evil but rejoices with the truth. It always protects, always trusts, always hopes, always perseveres.”
Love is real work, and love is much more than mere “fun”. Love is true Joy!
You are absolutely correct.
English is very poorly served by our having only a single word for the many aspects of “love.”
Love is a feeling and an emotion, certainly, but also it is (or can and should be) an attitude and a commitment. The latter two can keep you going during the periods when the first two falter.
Very few people will live together for a lifetime and always feel “in love.”