let's say there's a married couple, the woman always wanted to have a solitaire ring but the man doesn't have money to buy a solitaire ring the woman gets diagnosed with a terminal illness one day and the man who learns this buys his wife a fake solitaire ring indistinguishable from the original the woman becomes very happy but dies 1 week later

now let's think about this the woman before dying thought she had a solitaire ring and was happy but she didn't have a solitaire ring the woman had believed a lie
the man had no bad intention he just wanted his wife to be happy but he lied

is what the man did ethical?