He should have tried to understand Geet's perspective too.
Geet's mistake was her inability to make MAAN listen to her reasoning for forgiveness.....her FORVINESS had nothing to to with DEV AT ALL except that he was the receiving party of it. Her forgiveness....like her entire world revolves only around Maan.....and her decision to forgive was solely based on her need and her want to make a fresh start with Maan.
In her want and need to make MAAN happy and have a happy life with him, she has sacrifices even her core....she has chosen to forgive Dev....the ULTIMATE of all sacrifices.....because she has come to understand that until she breaks free from her past...she cannot have a clean untangled begining with Maan.
The difference here is that Maan has not reached this point at all. And if left to his own vices...he never will...because that is his personality. It has always taken Geet to convince him to change and see and accept things differently.....and so even with this issue...until Geet tells Maan on why she has decided to forgive Dev....Maan will not realize nor will he accept her decision.
Hope this made some sense....😕