I see other people calling out Madeline for being a spoiled brat (Which I don't disagree with.)
However Luke is a 30 year old passport bro who (allegedly) groomed a 17/18 year old who has stunted development and emotional baggage due to raising herself.
He is immature enough to try to gaslight her by accusing her of stealing the funds he sent her.
Did anyone else notice that all he has is the emergency funds his dad gave him to pay for the wedding? He said he has only $3000 which is the exact amount his dad gave him before his flight.