Shakespeare's romance plays are not love stories but the magical tragicomedies: The Winter's Tale, The Tempest, Cymbeline, and Pericles, Prince of Tyre. According to Wikipedia, "The romances call for spectacular effects to be shown onstage, including storms at sea, opulent interior and exterior scenery, dream settings and the illusion of time passing. Scholars have argued that the late plays deal with faith and redemption, and are variations on themes of rewarding virtue over vice."
I think Shakespeare clearly meant us to feel Romeo and Juliet were "in love" because their speeches together often comprise a single sonnet which is unique to them in this play. But, of course, they are star crossed: their love cannot survive in a hate filled world where marriage serves to unite families for political advancement rather than to unite two souls.
Whether Alison and Noah are in love or just have the hots for each other and fabricate the love story to excuse their affair is another matter.