Can I ask a guy why he stopped liking me?

So me and this guy dated for a little bit. But after a month or so he asked to stay just friends because both of us have busy work schedule and don't have the time for a serious relationship. He also said that does not have feelings for me anymore. This all happened a couple of weeks ago. Can i ask him why he lost feelings for me? If yes then how should i do it? If no, why?
Can I ask a guy why he stopped liking me?
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