I think this is more of a WWYD.
Yesterday DCs and i had a nice day out. We visited the country next door (we live in mainland Europe) something we do once or twice a year. The day trip is always the same; a nice play and picnic in a lovely quiet forest then an afternoon drink in a beautiful restaurant DH and i stumbled across a few years ago then the local supermarket (cheap border shopping). The restaurant is in an old house in the forest, it has a beautiful garden and when the weather is nice they put odd tables throughout the garden. It is very romantic and secluded. For us a meal here is a real treat as it is expensive. DCs and i picked a nice spot near the fish pond and ordered just drinks. Then I noticed that about 10 metres away at another table was the DH of my friend with another woman. They had obviously had a big lunch and were just settling the bill. He paid cash and as they got up to put their coats on and leave i quickly pulled out my phone and took a snap of them. The photo isn't great, you just see them walking away from the table.
My friend's DH is a local man. She is from an English speaking country and so is a foreigner here like me too. They have DCs, one of whom is disabled. Her life is not easy. Her DH does not earn a lot of money and she has to be a SAHM to care for the DCs. She has in the past joked about leaving him, but in reality it is very hard for her to do this (custody of kids, finances, visas etc). Generally i think they are happy but they have their moments. Her husband is a manual labourer and wears a uniform so this was not a work lunch. I helped cater at his surprise birthday party last year and so met his close friends and relatives - i did not recognise this woman from the party.
My friend and her DH know about this restaurant because i told them! AFAIK she has never been there.
WWYD? AIBU to just delete the photo and pretend the incident never happened? I wish i had never seen him.