Invited crush over but he said yes and then cancelled? why?

I invited my crush to watch a show with me on Friday and he said he’s down and sounded enthusiastic about it. However on Saturday midday he messaged saying he’s not feeling well and wants to stay in. He doesn’t make any attempt to reschedule and hasn’t since texted me. I have been the one who generally messages him first so I don’t wanna over impose and Text him again asking if he is feeling better or not. Question is, is he lying about being sick to get out of hanging out with me? If he is, why did he say yes to begin with and change his mind in 15 hours?
Invited crush over but he said yes and then cancelled? why?
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