FYI...if you ask why would ABHI be in Nandu's home at dinner time...the ans is he's already Chummy with Chachi...wud make sense for her to invite him to have dinner at their place...!!!...koi dhoor ki rishtedhari ka bahana bi banaya tha na...wud frequently visit her house now ...I think...thats why he knew that Nandini didnt take Manik's chole to college 3 days in a row