How do you guys feel about getting rejected after the second date?

I'm about to go on a second date with a guy since I wanted to treat him out this time as a friend since he treated me out yesterday for our date. I wanted to tell him up front that I don't want to be in a relationship atm.. Is that okay or does giving him that second "date" make him get his hopes up...
How do you guys feel about getting rejected after the second date?
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