I agree, you just should tell people first! Unsolicited story time:

We had been dating for a few weeks. She was smart, nice, and very fun. I really liked her and had decided to consider getting serious. I thought she had ghosted me for our dinner date, though, so I had left and was feeling sad. She called over an hour later to apologize profusely and beg me to come back, saying she’d explain and buy everything that night as apology.

What she didn’t mention was that she was going to alternate between incoherent rambling and staring, silent and unresponsive, into one corner of the cafe’s ceiling. I had no idea what was going on. I got ahold of her roommate, who said she had eaten a bunch of shrooms and walked to her friend’s house. I left after he arrived and I learned he was her roommate… and her boyfriend. Fun.

I went full no contact. Years later, we worked together briefly in graduate school, where she pretended not to know me despite having already told our lab mates we used to be friends. Super awkward, maybe mental problems.