How should I "take" this email from my advisor?

There are any number of things he could do to me. Maybe he couldn’t kick me out, but he could do his best to make sure I never finish. He could sabotage my job prospects (he’s a MAJOR deal in his field, lots of books and articles to his name) if he does let me graduate. I don’t think he would hurt me physically, but he’s certainly capable.

I think you are being hyper-vigilant here.

I was often like this; I keep looking out for signs or signals to measure the ‘strength’ of the relationship because I am not sure if my supervisor (boss or someone in a superior position over me, such as a friend I have come to rely on) really ‘likes’ me.

Though your supervisor could potentially hurt you, it is not a good idea to be obsessed over it. Is there any reason why he should?