Mike had a cut yes in round three. Bisping was hitting him with way more combos in 1 and 2. Go watch the post fight presser when your boy himself says that Bisping hit him harder than he's ever been hit and that he could have seen the fight go the other way.
I suggest you watch all of Sonnen's post fighter pressers... 'my boy' claims every fighter he faces has hit him as hard as he's ever been hit. That doesn't change the fact, however, that Sonnen's face was no worse for wear than Bisping's, and that Bisping didn't rock Chael... Chael rocked Bisping. That is damage my friend.