Why won’t he give me answer back

I messaged my boyfriend if you liked this girl that he was friends with and he couldn’t give me an answer he just kept on denying the question he couldn’t give me a yes or a no and so I asked the girl that he’s friends with that he talks to and I asked her the same question and I’m waiting on an answer back...  question was if me and him ever broke up would he be with this girl? he couldn’t answer that so me and him got in a big argument about it him not answering a question and so his choice was he’s not gonna talk to me until I drop it so I decided later after my appointment I’m gonna call him up and ask him the question again because he’s at work right now