Why would a younger guy initially flirt with me and give into my invitation to hangout with me and my friends, then ignore the next time I invite him?

Anonymous
We bumped into each other, we exchanged numbers, he flirted, showed interest, then gave in to my invitation to hang with my friends and I. He and I didn't flirt the day we hungout as a grouo. The week after completely ignores my text to invite him out again. He's several years younger. Is it my friends or me he doesn't want to see? I get that he may have lost interest, but why?
Why would a younger guy initially flirt with me and give into my invitation to hangout with me and my friends, then ignore the next time I invite him?
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