I feel Raj was just attracted towards this Manpreet mayb because of her stylish English accent and those wannabe looks😆...See in the precap he does not use the "Pyaar" word for Manpreet😉..he just says that "We used to like each other and wanted to get married"...this clearly indicates that in the past he din't hv much knowledge about this love but he wanted to marry her because both of them were similar in their nature😃...
Somehow I feel later Raj moved on in life because Manpreet was telling Raj something like "I wrote u so many letters but u never replied"😉..that time Raj had no answer😃...he could hv easily written one letter to Manpreet telling her the truth because that time he too used to hate Kranti...But mayb later Raj lost interest in Manpreet because it was not love but mayb fatal attraction😃
From Manpreet's side it was definitely love and that explains her chipkofying act as well😆
As far as Raj being chalu is concerned...yes he was definitely a chalu maal😆,..see even Sanjay once told him how both used to chase girls in college😉😆...so no wonder making coffeee and telilng romantic Poems to girls was one of his hobbies in college😆