Why is he doing this?

So I was on the phone to my boyfriend last night and I had to hang up as my brother was right outside my door and it was complete silence and I did not want him to hear my conversation. I texted my boyfriend and told him that I couldnt talk because of my brother outside and he said ok and then we texted eachother goodnight. Then this morning I received a text from him first thing asking where I disappeared to last night to which I explained again what happened and then he start saying that I should have told him which I responded I did and then he start responding "hmmm" when I told him that my brother was outside. I got a little frustrated and told him that i didn't know why he was asking this again and he replied saying "I dont need this shit from you". I feel like he is trying to be controlling or being paranoid. What do you think?

Why is he doing this?
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