What does "we'll see mean" when it comes to dating?

I'm going on a second date with this guy we talked about what we wanted to do and we decided on something and a time. Then I said maybe we can go to the mall after and he said "we'll see". Does that mean he's not interested? Because other than that we haven't really texted as much either we only talked about our date.

What does "we'll see mean" when it comes to dating?
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