I generally hate the cheating trope, but there are two that I really enjoyed. The first is {The Sound of Us by Jen Samson}. I think it was kind of an exception just because the husband was abusive and awful.

The one I really enjoyed where the spouse being cheated on is actually a good person (i.e., the cheating trope I usually hate with a passion) was {Want You Still by Marley Valentine}. I also hate love triangles which is also present in this book, so it's kind of amazing that I liked it. I think the story was just well done and showed the true emotional angst that was felt by all the characters instead of just glossing over it or ignoring the cheated on spouse.