Boyfriend broke a boundary, what do I do?

My boyfriend was cheating for a heavy 4 to 6 months. We've been together since last March. It took a minute to calm down when I found out and we went through our initial fight. We both wanted to fix our relationship and what not so we did, while fixing it though I decided to set some light boundaries to see how he fared. Well, one I set was a very easy very little boundary. We started playing this game together (valorant) and I told him I didn't want him talking to people he met in the game anywhere besides the game. However, I found out a few hours ago that he broke this. He said he knew about the boundary, I confirmed that much. My question is, was that boundary too much? If not, how do I punish it if at all?
Boyfriend broke a boundary, what do I do?
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