Was at an NBA game recently. In front of me a couple was sitting. The woman kept getting texts from another man. She would keep her phone facing away from who I presume to be her husband (both wearing wedding rings). Some of the texts were pretty suggestive, one being something like "I really wish I could be with you right now." She would quickly delete the messages after sending them. This made me extremely uncomfortable. I immediately thought about saying something or at least warning the husband somehow about his wife's texts. I contemplated tapping him on the shoulder and whispering something toward the end of the game, I thought about writing a message on a piece of paper and slipping it to him when his wife wasn't looking, or even taking pictures of her screen while she was texting to have as proof. I mean I'd wan't a stranger to tell me if I was in his spot. But ultimately I chose to do nothing. At the time I rationalized it in my head that he would believe the word of his wife over that of a complete stranger. And I felt like it might be weird to be taking pictures of a woman's cell phone if somebody saw me do it. 

I'm also almost 100% sure they were married to each other. They kissed once during the game and had two kids with them. The husband had his arm around her most of the game.

I keep having second thoughts about what I should have done, and I feel like a complete asshole for not doing at least something. 