> I know online spaces will tell you [being vulnerable] is dangerous, and that your partner might leave you.

The possibility of being rejected by being vulnerable is definitional... It's not being vulnerable if there isn't the possibility of rejection, it's just being transparent. So yeah, being vulnerable is dangerous. You might get rejected. But then again, you might get accepted, too.

(This isn't a critique of the parent, it's more of a critique of what the "online spaces" allegedly say.)