Boyfriend speaks to woman from work in a foreign language so that I don’t understand what he’s saying?

My boyfriend is working on a work project with another woman from work. They happen to speak the same language. They’ve been working on this for some time in English, but now they are speaking in their native language. I think they’re speaking mostly about work, but I don’t understand most so I don’t understand exactly what they are talking about. Am I in the wrong to be insecure about this? He closes the door to his room and I just don’t know what he’s saying, I have a suspicion he changed language so I don’t know what he’s saying

Boyfriend speaks to woman from work in a foreign language so that I don’t understand what he’s saying?
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