So basically I am in a new relationship after a few months of being single and reading some RP literature. Well I was on vacation for a month so I had to leave my then still plate for this period of time. Well as it turned out after about 3 weeks she asked me for permission to go out with one of her female friends to party. I was not amused by it but didnt know how to react. If i dont permit it i will seem needy if i permit it i will have to fear that she cheats on me and I will never find out. So in trying to manage the situation I kinda fucked it up and we had a huge fight which almost ended with us not seeing each other anymore. Well after a few weeks we are back together and I fear this situation will rise up again. How should I deal with it because if i make a scene out of it again I'm sure it will be over forever but I cant live with my GF going ou to party alone because I dont trust the guys which try to get every girl possible. What are your recommendations?