I think main problem of Ishaan and Suhaana is that they have very firmly and strongly believed that They are a mismatch and 'Superior Suhaana' can never ever love ' Bhondu Ishaan'
Since 1st day of their marriage Suhaana told Ishaan that he is not the kind of guy she would ever like and both still belive this although lot has changed since that day. They believe this thing so strongly that their mind choose to ignore the obvious signs of love like getting jelous,cooking food for ishaan, craving for his attention etc. Though suhana was doing so much for ishaan he never thought that she might be doing all this to get his attention cos he just belived that she can not care for him no matter how much he wish , how much he love her, how much he is ready to do for her he is not the guy suhana wants or would ever want.