So why is he not answering my question?

So I texted my ex to ask him what about me was a disconnect for him. Basically he told me he’d been seeing this other girl for awhile and saying how he feels about her and this that and the other. I thought him and I were getting back on the right path especially since I was moving. I had no idea about this girl until he came out and told me about her. Well I asked him what the disconnect was about me. I told him maybe it’s something I need to work on for the next person. I told him I was curious as to where things went wrong. Him and I y’all have to understand have been talking for most of this year, he was excited about me moving closer like I was. So when all this came out I felt blindsided. I thought it was going to be me and him. But I don’t understand why he just said no. Like he doesn’t want to answer my question. I don’t think he just woke up one day and wanted to talk to someone else, I feel like something happened at some point. But what does his response mean?
So why is he not answering my question?
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