This is an ensemble romcom done well— it’s well written, avoids cliche, and avoids the common ensemble comedy issue of a weak link; the actors have great chemistry, and a natural rapport.
Other favourites:
If you like black-and-white films, The Awful Truth or My Favorite Wife
If you like magic/magical realism, About Time, Practical Magic, Sleepless In Seattle
• Harold and Maude
• My Best Friends Wedding
• Four Weddings and a Funeral