are you having sex with your current girlfriend?if yes then your fornicating with both arent you? so why are you beating yourself up,your doing wrong in both situations...simply repent for both and rise up forgiven covered in the blood of the lamb and then move on to the next step rebuking and casting out sinful sexual behavior/a walk of the flesh in jesus name,remember the spirit is willing but the flesh is weak and the lord is not going to leave you but you must invite and give permission for the power of GOD to change you,heres a prayer for you;ANNOINTING THAT BREAKS YOKE,DESTROY EVERY SEXUAL SERPENT IN ANY AND EVERY AREA OF MY LIFE IN JESUS NAME...SEX IN THE DREAM BE REBUKED IN JESUS NAME I COMMAND....rise up and keep running the race my friend in jesus