This is ehbhh because Theo has set a precedent that everyone hugs hello and goodbye... then when Theo wasn't there and he hugged you, you didn't stop it.

Sooo (for future reference, set boundaries early. This convo could have been sooo much easier if you never let him hug you. There's nothing wrong with not wanting to be hugged)

You'd have to say something along the lines of "This isn't personal but I'd prefer if you didn't hug me. [You can explain why you'd hug Theo and not him if you want]"

I mean it might be kind of weird if he hugs everyone but you or if he sees Theo hug you after your conversation with gun, but I guess that isn't your problem 🤷