He wasn't angry at Geet for sharing his place...He was angry at being taken advantage of.....Old memories from his bitter past resurfaced...And he wasn't going to be a sucker again...And hence the harsh behaviour.
Like Dadi said, Geet is getting the punishment for someone's else mistake.
And don't think that I'm defending Maan...I'm not. He wasn't right at that moment...but we have to realize one thing...Men and women react differently when they are in fury...Men go ballistic instantly unlike women (well atleast the majority of them)
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