While I do agree that Maan is being a total a**hole, I don't think it's out of character. This is a guy who loves to be in control of everything, which is why he never allows emotions to get the better of him. Geet, even when he doesn't remember her, sends his whole world spiraling out of control. She has the guts to talk back to him (batameez ladki!), is completely involved in both his work and his family and everyone, contrary to his first instincts, seems to love her. Her being nice to him only makes things worse because he can't figure out how to behave around her and is taking all that frustration out on her. This is of course mean and unfair, but that's Maan, pre-Geet.
Give her some time to gather her wits. She will know what to do, and even if she doesn't he will probably end up falling for her anyway!
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