I don'r ship Johnlock, but I'm not in denial that John and Sherlock love each other. I just think their love is brotherly, rather than romantic. That said, I still say this is true. What Mrs. Hudson said about marriage is somewhat true, and it scared Sherlock. He felt like he lost one of his few friends the day of the wedding. John was the first person, I think, that he applied the word "friend" to, and he just lost him. He has so few true friends that that killed him.