Relatively recent story about wife and husband she goes on dates to fool around. He changes mind while she is in car but she has phone shut off

[Tomh1966]

I thought the person's name was Simon but that may be inaccurate. They talk about her going on dates. Likely a UK (Other European?) author as his name was not typical of the US.
2 chapters at least. May not have been loving wives. It was heterosexual. IIRC in chapter 1 he called while she was on her way but she had shut her phone off and chapter 2 was her dex date. She may also have been breaking rules that she had with her husband (not sure on that one)

Yes I looked