At the end did Theodore help the empress poison MC? Or was he just there at the party saw ...

At the end did Theodore help the empress poison MC? Or was he just there at the party saw the prince, and decided to unload all his pent up frustrations/petty rage on him? It didn’t show what happened after ML punched him so I wasn’t sure. Since it seemed like things were settled between them after the talk at his fathers funeral I didn’t really get it? ╮(￣∇￣")╭