Should I tell him or not?

There's this guy who's been constantly asking me out on a date that I finally agreed to and then on the next day my ex boyfriend came back asking us to try again. We talked and since I still love him, I agreed to us getting back together. Should I tell my now boyfriend again about the date i'm supposed to have with the other guy? I don't want to just ditch him.
Should I tell him or not?
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