What it means when a guy says 'we should catch up soon' and then doesn't make any really plan?

I was talking to the guy I've been on a few dates with. Last night he was at a wedding and I let the conversation end so he could have fun. Then he said 'we should catch up soon!' This morning I replied saying 'yeah sounds good'. He opened the message hours ago and hasn't said anything.

Was I meant to suggest a time? Should I just wait? Halp
What it means when a guy says 'we should catch up soon' and then doesn't make any really plan?
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