Lovey! Here's a question. What do you make of this dialogue from TAB? "Are you even in a fit state?" "For Mary of course, never doubt that Watson; never that." If he's jealous of, or prickly towards Mary at all for having 'taken' John away, why does he s

This has been niggling at me too!

Okay, so, some initial thoughts. It’s very specific what he says. ‘Never doubt that Watson. Never that.’ I think what he’s acknowledging here is that he will always put John’s happiness, or what he THINKS is John’s happiness i.e Mary, before his own. Sherlock must absolutely hate Mary and what she means to John, but as we’ve seen in HLV, he desperately squashes down all of those emotions and does his best to make their wedding absolutely perfect. He puts Mary before himself, and always will, for as long as he thinks that that is what John wants. 

The thing is, I can’t decide whether or not Sherlock knows in his fever dream that Mary is bad news. I mean he’s got John and Mary unhappily married, he’s got all the visual clues for Mary being the abominable bride &/or Moriarty. We’ve had ‘that wife, John Watson is definitely in danger!’ But I still don’t think he fully acknowledges how dangerous she is, at least on a conscious level. He can’t have, if he was prepared to leave John with Mary when he was sent off on his suicide mission. I think he still believes that Mary is who John really wants. Series 4 will let him realise otherwise.

As for what you said about ‘the problems of your future’ line, I think you’re absolutely spot on. Whether or not it’s subconscious I think it’s a definite indication that Sherlock will always be prepared to do SOMETHING about Mary. No matter how physically and emotionally exhausted he is, he will always be ready to put John’s needs first, and he will always be ready/prepared for her. ‘Never doubt that, Watson. Never that.’