So I was a coach at a club for many years. You could hire the bar and hall out. One of the kids I coach got married, (no longer a kid) and we booked the bar for his wifes birthday (25th I think it was) which was a bit after her actual birthday. My friend bought her a new phone for a birthday and this is how he found out.
Apparently he picked up her phone by mistake and went to work. She called him to tell him, but he was on the train so couldnt come back but she was reluctant to give him the password. I was told by his brother that he saw a message alert early in the morning that was not what a husband would want to see. Its not hard to get access to a phone if your willing to youtube how.

At the party, when everyone was there he grabs the mic and says he wants to make an anouncement. It went something like this. I thought I would do something realy memorable for Charlie (charlotte) and he rolls out this projector and starts showing pictures from all her birthdays. It starts with some old vids and pics of her at all her other birthdays. Family. Nans etc. Then He says, last year she made me the most happy man alive, there was some pics from the honeymoon, a video. Everyone is loving it. Chalies is crying, her freinds are all crying. Then he has edited it so the clip of them on a beach has a old school record scratch and it stops. And everyone is puzzled.

"So. Imagine my supprise when I accidently take her phone to work and she doesnt want me to have her password as its a breach of her privacy. She has mine I have zero to hide" (words to that effect). "So it got me wondering. Whats on there". I mean shes starts freaking out. And he starts showing all the text messages and a couple of blured out pictures and screen caps of videos, it left no one in any doubt she was cheating. But some of the messages she sent saying some pretty disrespectfull and hurtfull things, well not many people where her fans. Apparently the guy she was cheating with was there and he made a sharp exit, work colleague.

"So to mark this momentus occasion I got you this" and his brother hands him a envelope and he passes it to her. I think you can go home with whoever you want but were done. And litteraly drops the Mic. Walks away with his brother and parents and his close mates.

Left me and the staff to listen to her and her family make it out she was the victim. Sadly she did better than him in the divorce. She used this as evidence of him being cruel to her and abusive. We all know thats a crock of shit, but thats lawyers and courts attitude to men it seems.