A better ending?
Since many seem to feel this film needed more of a twist at the end, what do you think it should be?
I'd suggest:
--we not know about Pat's lover until the end. Then let's say she actually dies from the poison -- and Harry discovers to his horror that he needn't have killed her after all. They could've happily divorced and lived with their lovers.
-- Harry does succeed in killing Pat. He goes to Kay -- and discovers (as we do) that Kay and Richard have become an item. He also finds out about Pat's lover. He's left realizing he's misread everybody in his life. And Richard too feels lousy, realizing he could've prevented it all (by encouraging Pat to leave Harry) -- and that now he and Kay are truly going to build their happiness on the unhappiness of others.