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Liberty wrote:
The "couple" speech is odd, but it clearly doesn't mean a couple in the sense of people in sexual relationship - we know that they're not. If it was just that John wanted to get together with Sherlock, then the truth would now be out there, and if Johnlock existed, Sherlock would now know John's intentions towards him. But nothing comes of it, so it's not that either.
Irene also revealed that she is totally gay in the "couple" speech. Maybe Sherlock is devastated because of that?
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I doubt it. I think he is resisting his own attraction to her rather than trying to attract her to him.