Russian melodrama. Original title in Cyrillic: ДЕНЬ НЕДЕЛИ — ЛЮБОЙ (Any Day of the Week)
Alexey and Tusya have lived happily married for years. But after his wife is diagnosed with a fatal illness, she decides that her husband should start life anew with another, very young girl. Alexey resists the new feeling, but it draws him in more and more. What should he do now: stay with his dying wife or dive headlong into another life?
Daria Kvasova
Evgeniya Kregzhde
Oo! I know this one! Dive headlong, dive headlong !
Also acceptable: threesome.