[Steven feels bad about how much this seems to be stressing Peridot out, his initial feeling of insecurity fading as he perceives how she's approaching all of this. He's angry that Blue Diamond is making Lapis and Peridot feel this way, more than anything else. Yet, its hard to imagine how to do anything about it without making it all worse.]

... I never did have any reason to lie to you.

[It's just thoughtful, rather than any real attempt to argue the subject. It's just something he wants to say.]

You were... one of the only gems I ever met, who didn't see my mom before you saw me.