I agree w everyone here that Lucas was too rude to poor Aternitas. But honestly, he was just being a grumpy old guy who was not in the mood for nonsense. Not an excuse really but he's probably dealt w too many ppl not being able to understand him (cos he sucks at teaching basically. He teaches like Hinata from HQ lol) Besides, he's changed a lot from back then thanks to Athy.
Also about the age gap, at this point, it doesn't matter how old Lucas is because irl no ones ever gonna be 1000yrs old. He might as well be 100 (for human years). And Athy herself is old, this is her 3rd life & she was a working adult in her prev one (modern world) so she is approx 60-70yrs old now? Athy & Lucas are both old & at this point age doesn't really matter. They are both just very compatible.
But with Ezekiel, he is still a young teen while Athy is way older.
What Ezekiel said to Jeanette tho was a bit too harsh :') He has grown up w her his whole life & should know how sensitive she can be. I might not care much for Jeanette, but it still sucks to have someone say that to you. He could have just said he liked Athy romantically but liked Jeanette as a sibling. But saying Athy is more important to him is very hurtful. She is already trying her hardest to find someone who loves her.
Then again, I can never feel as bad for her as I did for Athy. She still lived a relatively good life. She had everything she needed + Ezekiel taking care of her etc. Athy's prev life was miserable. She was living like a pauper even tho she was a princess, she was treated like a nobody, shown up by Jeanette on her own debutante etc etc. In that life Jeanette KNEW Athy was Claude's daughter but idk how much she did to try & get Claude to accept her... In this life no one technically knows Jeanette has jewel eyes (Athy does, but she also knows she is Claude's only daughter). Despite all this, she is still very kind to Jeanette & tries to make her feel accepted.
I think the problem just comes down to Jeanette being selfish w/o even realizing it. She is naive & unaware of everything else. Athy is always considerate, even in her prev life.