I think Samaira will fall in love with Arjun. When she finds out about the revenge plot, she will be heart broken and will break up with him. As she detaches herself from him, Arjun will then realize he's also in love with her and want to get her back. Hence begins the struggles of him winning her back.
I really hope this is how it happens. I really really want Arjun and Samaira to end up together. I hope that's how it plays out.