I didn't realize that part of being John's friend was to approve of his relationships unequivocally. I'm no expert, but I'm fairly certain that's not how it works.

[His attention returns to John, as he honestly doesn't want to deal with Sherlock or his mini tantrum. He doesn't understand why his answer over the phone wasn't enough.]

What I said before wasn't a lie. I wouldn't agree to it if I didn't want to. My dislike of things doesn't change the fact that you both have enemies who would take this as a chance to hurt you. So I will come to make sure that doesn't happen.