So if a guy texts you "I'll text you later" does it mean he's not interested?

he had said maybe we'd go to the movies tonight, we talked on the phone yesterday for a bit and had tentative plans Friday night. he just said he's at his family's place.

haven't heard from him since a few hours ago... yes I like him but haven't texted back much except that I'm working out.

what do you guys mean exactly? what do you mean by "later" ?
So if a guy texts you "I'll text you later" does it mean he's not interested?
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