YOU SAID:

i have a girlfriend but she goes to another school

INTO JAPANESE

私は彼女を持っていますが、彼女は別の学校に行きます

BACK INTO ENGLISH

I have her but she goes to another school

INTO JAPANESE

私は彼女がいますが、彼女は別の学校に行きます

BACK INTO ENGLISH

I have her but she goes to another school