“And the next time you feel your heart going out of rhythm, just hold your breath, and remember I will see you again a couple of weeks from now.”
Ah wait, no they don’t, because “resilience” is a worthless concept in emergencies, both mental and physical.
Therapists will likewise encourage you to build up resilience so that "a relationship ended" is not a crisis, and also build support networks of real people who can really come visit you when you need urgent support.
There are also, of course, crisis hotlines.