
Imagine this situation from his point of view. He's always told Lulu he loves her, always giving her gifts, always sending letters. The man even shortened their wedding date to literally the next week. He's never stopped showing her how much he loves her even on the day she left. She just kept assuming things. Is it that hard to just ask him "hey did you kiss the Saintess? I saw y'all outside the temple."
Get mad at him, slap him, go up to him, do anything but disappear with his child that he didn't even know he had.
Imagine wasting 7 years of someone's life over a misunderstanding that could've been easily resolved. Then she has the audacity to say we hurt each other ヽ(`Д´)ノ
The only one who hurt anyone was you, Lulu. Also, imagine being this selfish where you'd abandon your loving family, your fiancé and everyone in your life because you didn't have the guts to at least try to figure out what happened.
Tdlr: Lulu is the main antagonist of her own story, and her self-destructive ways ruined everyone's life and wasted their time.