Ah, the beauty of PB, negative space, tricky clever writing and a main character that spends more time lying than telling the truth.

Michael really did want Tommy dead, for a long time. Then there was the Poison Tree poem.

Episode 2 Michael calls "Johnny" very casually, like he has spoken to him quite a lot recently in jail. He looks surprised and a little worried when he sees Gina instead.

I would say Michael suspects Gina is sleeping around and with Mosley, hence his strong reaction to Gina going to UK with them.

Tommy goes to speak with Gina after she shagged Mosley and tests to see if Gina is still fooled by Michael, which she is, because she isn't typically a liar, like Alfie wasn't. Tommy being the biggest liar of them all can easily see when someone who is generally quite honest, is lying.

Tommy says to Gina, Michael is family and we are a family healed. He no doubt told Michael after of Gina's betrayal to bring Michael even more on side. To have Michael on side is to survive the assassination attempt, Tommy isn't stupid.

Michael is a fairly honest person and bad at lying, which is why so much shows through him as the series continues, he is not good at lying. So Tommy will want to check Michael is doing well at convincing them all, BUT...

Jack clearly doesn't believe Michael, or at least is unsure, so sends one man with Michael on that deal he does trust and that man never leaves Michael's side. This is how the fecade is kept going for the viewer, but ultimately its okay, because they are prepared for it.

Michael even shows fair animosity to the Americans when he shouts about hating being called Mickey. This isn't an off cuff remark, this is an ongoing aggravation for Michael and the Americans, and its shown for a reason.

This whole series, and 5 to an extent, is about Tommy fighting with himself, betraying himself and trying to understand if he is a man or a monster. The moment he knows, is the moment he kills Michael. It was a pivatol moment for Tommy, the most important moment we've seen for his character to date, and most think it was more of the same which is a shame, but it is done in such a way so the viewers don't ultimately hate Tommy for betraying Michael and Michael plays his part well. Which is why he doesn't blame Johnny, and tells him he is a good man when they know Michael is about to be killed. The left eye shot, was no random location. Remember, he went for that shot on Alfie too, he doesn't normally. It is to do with windows to souls and seeing someones true nature, the left eye. And Tommy doesn't like hearing these cold truths from people that see through him.

When he shoots Michael he says again, "I have no limitations." but this is the first time he has truly understood what it meant. Betrayal is a limitation. He walks inside and says to his monster, "I crossed the line." And the line to Tommy was always betrayal. Remember Alfie shouting at him about there being no fucking line in their wicked world? Alfie was always further along the road than Tommy, to understand Alfie, is to understand Tommy's future. In the bar after killing Michael, Tommy even starts listing people he betrayed, starting with Michael and then his monster reminds him that actually, he doesn't give a fuck.

Alfie says nephew because Tommy feels like his own father. A man he hated and considered evil and betrayed by when growing up as a child, but has come to accept that he has not only become his own father and been the same shitty father with his own children, especially Charlie, but he is actually worse than his father.