Our sources did earlier confirmed that Mithoon sir had composed two tracks for the music album of Half Girlfriend and we it was quiet clear that the second song will either be reprised version or will be unplugged version of Main Phir Bhi Tumko Chahunga.
Well on 28th April, 2017 with the revealing of the entire tracklist, the doubt about the song was all-clear as the second song by Mithoon sir was Reprise Version of Chaahunga, but with a new/different name. The song is named as "Pal Bhar(Chaahunga Reprise)" and who could have been a better choice than Arijit Singh for this song. Earlier there were some mist regarding the singer of the song as there were some rumors that Ami Mishra might be composing as well as singing the song but now it's all clear.
The music as well as lyricist of the song are all the same as of the original version of the song (talking about Phir Bhi Tumko Chahunga) i.e. music for Pal Bhar is composed by Mithoon, while the lyrics been written by Manoj Muntashir. The only difference between both the version is that; Shashaa Tirupati won't be rendering any verse of the song. The full song Pal Bhar is available under the label of Zee Company.