What movie is this?

Movie: 45th anniversary? 45 years? (20 15)?

Synopsis?

While Kate was busy preparing for her 45th wedding anniversary, her husband Jeff suddenly received a message that took his thoughts back to the past. The body of his girlfriend who died in an accident in the Swiss Alps 50 years ago was found.

Kate and Jeff are deeply shocked, but they can't communicate each other's deep anxiety. Jeff locked himself in a world of memories, while Kate tried her best to suppress her jealousy and anxiety. She also needs to concentrate on preparing the party, arranging music, menus and the like.

On the surface, everything is as usual, but the camera keenly captures the process of harmonious coexistence gradually becoming unbalanced. Whether having breakfast with Jeff or walking alone in the town, Kate feels more and more like a stranger. The 45th anniversary couple were troubled by unexpected emotions and forced to face their strange feelings. In the process, their good times seem to be gone forever. After living together for 45 years, which emotion will prevail on their wedding anniversary?