What do guys mean by keep it casual and avoid hurt feelings (he said this after I said I would be moving away for a month)?

We’ve been on a couple dates and I really saw the relationship potential and told him straight up from the beginning what I was looking for.

Should I chill out, hang and wait too see what happens after I move back or just move on?

What do guys mean by keep it casual and avoid hurt feelings (he said this after I said I would be moving away for a month)?
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