this is a board for people to show off their bodies in a way that builds camraderie- a new level of understanding that naked bodies should be appreciated and not shamefully hidden. It's playful, good natured, and positive. I think it's totally different than a wife who decides to text titty pics to a co-worker. That's an individual act that is either a minor indiscretion, a momentary lapse in judgement, or a marital betrayal- that's up to you, bro.
I wouldn't equate the two AT ALL... I think it's up to you to decide how you feel about what she decided to do. If you love her, and things are for the most part good and solid, be happy that some other dude gets lucky enough to get a big boner from her rack- and let it go at that. It didn't happen in person. If you can't let it go, then consider it a "warning bell" and try to do a bit more to regain her passion that YOU are her prince and should be her one and only plaything.
Merry Christmas, bro- and thanks for sharing your hot pics.