What is Insecurity? (Re: Zero, Regulus Corneas)

This video concerns one of the most insecure characters in fiction, Regulus Corneas. Re: Zero Season 3 has completely deconstructed this character with everything culminating in his named episode (Ep 62), and so I wanted to share my thoughts in a way that's completely safe for anime onlies.

Some extra stuff:
I found another layer to Regulus trying to kill Pandora after finishing the video and am too lazy to add it in so I'll say it here. Pandora asks Regulus, "Do you feel nothing towards them?" in reference to Geuse and Fortuna's desperate struggle against him, and Regulus takes an extended look at them. However, it's right after this that he attacks Pandora, explicitly calling her a woman. I think this is because the closeness he sees between Geuse and Fortuna is in complete contrast to his relationship with his wives which angers him greatly.
Meant to say "she pities Regulus" but again too lazy to fix this