Why is he hurt about me leaving him if he is not that into me anymore?

I’ve been seeing this dude for 4 weeks when I noticed that he would text me less and less and be less affectionate when we were on dates. I assumed he was slowly losing interest in me but wanted to keep me around until he finds someone better so I pulled back. When he finally addressed me pulling back I told him that I feel like he is not that into me anymore to which he reacted very hurt. He claimed that none of my accusations were true, that he just doesn’t want to spend as much time on his phone and that he was very busy lately since he would have to take care of his sick kids (age 7 and 10) that spend the last 2 weeks at home but didn’t seem that sick. We argued for about an hour and he believes I just made things up because I don’t like him anymore. Why does he even care if he did not into me anymore?

Why is he hurt about me leaving him if he is not that into me anymore?
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