After the sentimonster's defeat, as his original persona he apologized to Ladybug for his actions once again hearing from her that he's irreplaceable.
Encyclopedia of Television Shows: A Comprehensive Supplement, 2011-2016.
During "Weredad", he knew she would appear at the right moment.
He encouraged her to focus on saving them, which what truly mattered.
[Miraculous Ladybug Kinder Surprise, Ladybug's chocolate eggs are coming soon! To his constant exasperation, she doesn't seem to reciprocate his feelings.