Albert isn't a bad person, but during the their fight with Demon king, he was aware of what was happening to Rei, he knew he was sacrificing Rei, but nevertheless choose to prioritize his revenge knowing he and everyone would end up ruining Rei.
At the end of the day, he could only afford to care for Rei after his revenge was settled, Rei wasn't his priority and Rei wasn't important enough to him at that time, not as important as revenge at least. But who could blame him? I mean, most in his shoes would choose revenge, even if it means breaking someone innocent in the process, but I still hate his guts for trying to make amends for it. If he choose to be ruthless with his revenge despite knowing the consequences of breaking someone else, he should have just been ruthless till the end. Half-baked guilt is always the cheapest, knowing he would have still chosen to do the same thing if he had to go through it again.
Albert isn't a bad person, but during the their fight with Demon king, he was aware of what was happening to Rei, he knew he was sacrificing Rei, but nevertheless choose to prioritize his revenge knowing he and everyone would end up ruining Rei.
At the end of the day, he could only afford to care for Rei after his revenge was settled, Rei wasn't his priority and Rei wasn't important enough to him at that time, not as important as revenge at least. But who could blame him? I mean, most in his shoes would choose revenge, even if it means breaking someone innocent in the process, but I still hate his guts for trying to make amends for it. If he choose to be ruthless with his revenge despite knowing the consequences of breaking someone else, he should have just been ruthless till the end. Half-baked guilt is always the cheapest, knowing he would have still chosen to do the same thing if he had to go through it again.