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Was all of that intentional? Yes.
Did he feel bad about it? Kind of?
Does he regret it? Nope.
Vendrick didn't allow himself to get so caught up in things that won't necessarily affect him that much. Though he did feel quite annoyed at Lucia, he did also pity her. Currently, it is unknown to him whether this world is real or not so with that in mind, he decided that it would be better to let her understand the reality of her situation.
Sure, he could've spared her and just let her fall into slumber but that would be unfair no? Not everybody thinks that being Undying is a blessing, sometimes it is a curse. Lucia had lived far too long and was the only one left. She already suffered enough so he should at least tell her the truth and let her decide her faith.
