I am really not that bothered about the sleeping with his brothers wife thing, it is classless but most people are selfish cnuts and I have heard of worse from within my circle of acquaintances, infidelity is rife. The hypocrisy stands out to me.
Rio was accused of carrying on a 13 year affair with a former girlfriend while also having loads of others affairs with models, no-one cares. Beckham fecks Rebecca Loos, and who knows how many others, no-one cares, both still media darlings. Lets not even start on the things Cristiano has been accused of. So pretty clearly infidelity is not that big of a deal, but the betrayal of a family member is, but not really if it is just a wife or husband, or if we want to like you.