We had agreed on something casual, why would he ghost me?

Anonymous
So, this guy had been chasing me for a long time and had talked to my friends about me. Since I am moving abroad, he tried so hard to convince me I better stay here and postpone that plan. Later, he asked me out and told me we could enjoy the next 2-3 months even if I want to go, and I agreed. We started sleeping together and after 2 weeks he stopped texting me and didn't reply to my text message. And I stopped texting him, too. Now my question is, I was not looking for anything serious and I never acted needy or attached. Why would he do it? He could simply tell me he had changed his mind or just meet me 2-3 times more until I am gone. why the ghosting?
It is not like I am heartbroken or hurt. I just cannot stop thinking if I was SO boring that he could not wait a few weeks more. Well, a few days before ditching me he said I was a very caring, gentle, kind, and delicate girl, by which I think he meant boring.
We had agreed on something casual, why would he ghost me?
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