I'm not ready to date anyone so that scenario is probably never gonna happen, or that would be cancelled because I would be panicking at the idea of a date. But assuming I somehow felt like dating, then once the date is set I wouldn't be able to cancel it because I would feel too pressured to go. Maybe, just maybe, if it's with someone I trust, someone with which I know for sure canceling would not hurt them or hurt our relationship, or if the consequences of not canceling would be far worse, then maybe I would tell them everything. I almost never open up that much though, unless I am really seeking attention.