He canceled our second date, should I be worried?

I met a guy on hinge. He messaged me first. He’s a med student so he’s always doing school work. Our first date was by me asking him and although he said he was very tired he still took me out. He told me he wasn’t interested in having a girlfriend right now because of his schedule but he thought I was girlfriend material, and he would like to see me more. I thought to not take this too seriously and have fun (no that does not include sex lol). We text but it’s hours apart, but when I don’t text him back he gets scared and messages me to make sure I’m still there.
I went to the movies alone and posted it and he said that he wanted to go and arranged we have a movie date. The morning of he asked if we were still on for the date and I said yes, but a few hours before he told me we have to reschedule because he is exhausted. I told him that I understood.
I know I’m a very gullible when it comes to people and I expect them to tell me the truth, but am I smelling bologna?
He canceled our second date, should I be worried?
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