mmc falls in love with fmc after his wife dies

A few months ago I read {The Smallest Part by Amy Harmon} and I would like to read something with a similar plot (in this book all three were friends since childhood) but I would like the heroine to be ONLY the hero's friend (of course the heroine and his wife are also friends, but they are not particularly close, you know what I mean, each of them has their own group of friends etc.) after the wife's death the heroine helps the hero through the mourning. I would also prefer the hero and his wife not to have any children, but it is not necessary (I also have nothing against a scenario where the hero and heroine meet and become friends after his wife's death). Only CR please. Thank you.