Am i in the wrong?

Id just like know peoples opinions. Im english my partner comes from a different country and he frequently talks to his cousin in a different language. I asked him today what were you guys chatting about and he turned around and said 'its none of your fucking buisness what i talk to my people about. I never said it in a accusational way as weve been together a year and i fully trust him, i guess i was just being abit nosey and curious. I guess that teaches me hey! But really id never say that to him if he asked me as i think its rude, and now it has made me think, what IS he talking about? I know people have their girl to girl, man to man talks, but i was just asking as a question i didnt need to know details.

Am i wrong and am i being over the top or would any of you feel the same as me about this? Never the less i know to never ask that question again 😕