[Steven freezes for a moment, his hand still on the glass he just set down on the counter. He trusts Peter, but he doesn't know how to explain this without scaring the teen off. He already struggled speaking to Dr. Osborn about it, and that's someone who has personal experience with a similar situation.]

... Yes and no. I s'pose you could call it that, but... Marc's more like my best mate. My partner. We were always together, even if it didn't always feel like it. [And if that sounds like it's implying something else, Steven's not hearing it.]