Guys, why would one say 'maybe another time'?

I don't understand this:

when responding to a text for a hook up (say 2 other nights we texted but never met up-and we have in the past) the guy says can't 2night but maybe some other time.

Does this actually mean that or coupled with the lack of getting together previously (and I'm the one doing the initiating) that he is just not interested?

And if it is the latter-which I believe it is-WHY can't yall just say hey I'm not interested in a clear straight-forward way?
Guys, why would one say 'maybe another time'?
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