When Francoise Sagan wrote "I have loved to the point of madness; which to me, is the only sensible way to love." she was refering to Achilles and Patroclus and no one can change my mind
Steve: Bucky... Why did you draw a pentagram on the floor?
Bucky: Your text told me to satanize the house before you returned.
Steve:
Steve: I wrote sanitize, Bucky.
Based on this beautiful prompt by Anon. Steve becomes the guardian of Vormir and is unable to return. Hence, Bucky goes to Vormir; ever unwilling to leave the other half of his soul.