Sorry, misunderstanding. I thought you were referring to a quote.

Sherlock is blunt and arrogant but I've never seen him as heartless.  He just keeps everything tamped down so firmly so that it doesn't interfear with his work.  To me that makes it all the more emotional when his vulnerable/emotional side slips out.

Janine sums up Sherlock's default mode very well: "Heartless manipulative bastard." BUT I see his default mode as being a survival mechanism, not a character fault. Sherlock is so used to being bullied that that's how he lashes out first. It's only when he's called on his behaviour by good people that he breaks out of this pattern.

We've seen this with Molly, John, and even Janine (by his reaction to her saying that he should have been straight up with her -- wow, she likes me and she would have helped if I'd asked!).

Sherlock is really growing as a character as his circle of friends expands. He's beginning to understand the impact that his behaviour has on others and is working at improving himself.  He's gaining more insight into himself (compare his ridiculous character analysis of himself in SIP versus that in TSOT).

Mary

It was one of 13 possible scenarios. He knew that Moriarty wanted to see him dead. But he didn´t know how this could possibly happen. It was only one plan to prove that he really died. And not only prove that to Moriarty himself - he possibly had to prove that to others. That´s what he considered in advance.

I disagree here - for me the tears were always real. But, real or not, he knew that it could be possible that he had to be convincingly dead for the outer world (not necessarily for Moriarty, and not neccesarily so for John - but if John is convinced he is dead the rest will be this as well).