The Years Between (1946)
I only watched this because Michael Redgrave was the star, playing an officer who is lost in the war and comes back to find his wife (Valerie Hobson) has made another life for herself (nearly married a family friend) and to make matters worse, taken his seat in the House of Commons, to which he is very miffed.
Drags on a bit seeing her make her new life and it's a story that's been told before and since, but with a slightly different slant.
Other actors were the lovely Felix Aylmer, Flora Robson, Dulcie Gray, Edward Rigby, Esma Cannon and brief appearances of Michael Horden and Katie Johnson of "Ladykillers" fame.
Just about worth a watch.