Season six, episodes 14-26
Spike, are you saying you've betrayed me by befriending Thorax?!
Spike, how could you betray me and Equestria?
Wait a minute...This reminds me of something...
This is similar to what happened with me and Trixie. I wasn't willing to give her a chance at first.
I won't let the same mistakes I made with Trixie happen again with Thorax
"Spike, I'm so proud of you."
"You're a celebrity here in the Crystal Empire..."
"...and you just risked all of it for a friend."
"I can't imagine anything more brave."
"...and if Spike says he's his friend..."
"...then he's my friend too."
Thank you, Princess Twilight. You're welcome, Thorax. Sorry for misjudging you before because of my past with Chrysalis.
Glad to see you two came around so quickly once I accepted him.