Why would a guy do this?

If your talking to someone, would you tell them basically that you “are about to have a drink with a friend.” A guy I’m talking to texted tonight. I asked what he was doing. He texted he was about to have a drink with a friend but not sure after. No we are not exclusive but I kind of don’t want to know if he is out here n dates. I don’t get it. I don’t tell people I’m talking to that I’m going out on a date. Would you keep talking to someone who does this?
Why would a guy do this?
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