Let me address those in no particular order . As far as the wanting sex from the other girl is encourage you to not step out again with premarital sex . As the story of David and Bathsheba taught , sin did not arise with the temptation but with submitting to it . With your situation with your girlfriend the very first thing I would encourage is discussion allin noholdsbarred intense real discussion between you and her identifying the issue and what steps you can take to minimize the encounters . I would also encourage you to find a brother in Christ to provide accountability for you on this area . I understand what you ' re going through . Stay strong and believe me when I say that if you reconcile this issue now before your relationship progresses to marriage it will be a great success for your future . Good bless ! !