Why did my ex message me first then not reply back to me?

So my ex last week wanted to ring me to clear the air and he wanted to apologise to me. He said the way he treated me was wrong and he said knows that now and that his sorry and that I treated him amazing, I’m the best looking girl his ever been with and gets jealous of that sometimes and also said I was the best sex his had. He asked if we could meet up to chat and I said possibly I just feel abit shocked by all this because after things ended he dated someone else I asked him what happened with her and he said It just didn’t feel right. Then 3 days ago he requested to add me on Instagram and I thought I’d just accept the add he then messaged me on Instagram saying he had a dream about me and I replied back saying did anything decent happen in it? And he hadn't bothered to write back to my question. I now don’t know if he just wanted to talk to me due to boredom or what? and what he was saying to me on the phone was just load of rubbish. What do you guys think?

Why did my ex message me first then not reply back to me?
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