You both were just hanging out in his room as you were telling him about the stuff you did with your friends- and since he's a proxy, he doesn't know much about your friend group. So when you bring up a guy, he seem to tense up as his jaw clench- are you serious? You know how jealous he could get.

"W- wait- wait. 'He'?" Toby grumbled, his eyelids twitch slightly as he felt jealousy burn in his veins.