FNF SILLY BILLY(GET REWARD WITHOUT ADS)

Last Friday, Hit Single Real - a night music battle got a funky update with a bunch of new songs, one of them being silly billy.
In silly billy, Boyfriend is confronting Yourself who is behind the mirror. Yourself is not an corrupted BF.EXE, it's actually BF in alternate universe. You'll also see a GF verison of Yourself during the lyrics part which she also sing along aside yourself in spirit. So, Where's the real girlfriend at? Where can GF be?