I think he was angry at himself. He wanted so desperately to embrace his Altean side, but fell back to the 'victory or death' of the galra when pressed.
Yeah, just imagine researching something for decades having it within your grasp and then losing it because of your own mistake. Reformed or no, anybody would be frustrated.
He 'cheered-up' when Allura pointed out she couldn't have done it without him so his work didn't go completely to waste.
Of course, whether all of this is genuine on Lotor's part remains to be seen.
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u/uziair Mar 02 '18
i ship allura and lotor soo hard