True Maan did cage Geet into this marriage yet he stands at fault and also is not at fault for Maan he wanted Geet and was shocked to find out that his brother was in love with her while Geet agreed to marriage to save her uncles name but she still loved Dev .
when she found out that Dev was not at fault she immediately started hating Maan while Maan on the other hand cannot take her hatred and rejection towards him so yes its wrong but he does gets out of control and hits her on that whether he is obsessed or not he should not hit her
Geet feels that her life is like living a wh**e's life but why does she feel that she is married and yes coming together should be consented by both but at the moment I'm thinking that Maan cannot control his urges and her rejection and that just leads him further to make love to her forcefully
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