What were Lavan's gripes in this verse?
Malbim: You acted improperly towards me, and towards my daughters. Even if you thought that I would not allow you to leave, you may not leave without my permission! One should not use evil methods to get what he cannot get fairly!
Ha'Emek Davar: You made it seem that I do not love my daughters, to take them from me without a Brachah. Really, I love them! In the next verse, he scolds him for fleeing.