also, with the adriana thing CM did actually consider flipping. remember right after she tells him (after he beats her up) before he goes to tony, he goes to the gas station. at the gas station he is gassing up the hummer thinking about what to do. That is when he sees a poor family all climbing into a piece of shit car. remember the dad had a great mullet and was carrying mountain dew? that's when CM decided to go to tony instead of going into the witness protection program. he had adriana whacked(i.e. did not flip) because he didn't want to give up his lifestyle, not just out of loyalty.

later on when he's pouring his heart out to jt, he wishes that he would've flipped back then instead of giving up Adriana. He realizes that he made the wrong decision back then. He's drowning in regret. He then makes the decision of a lifetime. Not only will he flip but this time he'll make damn sure that this time he can't he sober up and back out. In killing jt he removes the decision this time around. he knows the cops will have him dead to rights and he'll fry if he doesn't flip.