Pls Help Find My Song :(

i only know the verse. its an r&b sung by a gurl and a guy.

(guy)
cause im mr mr lonely
open up the door and what did i see
my baby with another man right in front of me
and what did i do to lose my boo

(gurl)
i never meant to hurt u baby
without you in my life id go crazy
oh why oh why did i have to get with that guy
now im lonely yes im lonely

i need the title and artist pretty please!

Your lyrics are very close to Akon's song, "Lonely" (which is an updated cover of Bobby Vinton's song, "Lonely"). However, I was not able to find a duet version that featured a female artist.