Band named wolf something.

I have no idea who the actors are. I can’t think of the name of the movie I only watched half of it (automatically started playing after a different romcom). It’s not showing up on my “keep watching” list on hulumight be on a showtime listing. It’s about a couple who moves in together. The guy is in a band named “wolf” something. His bandmate is engaged to be married to his girlfriend’s sister. The sister works at a bookshop. I proposes to his gf during his concert right before he goes on tour, she to leaves without answering.