Ari Aster's Midsommar took audiences on a journey of what a toxic relationship looked like. Dani (Florence Pugh) couldn't recognize her boyfriend Christian's (Jack Reynor) toxic behavior until she went on an unexpected trip to Sweden with him and his friends. Playing around with foreshadowing and poignant commentary, Aster created a cult classic horror film.
Source:https://www.cbr.com/midsommar-ending-explained/