Bruv firstly you need to ignore the advice given to you by the vast majority on here!
This is now a matter of some urgency.. If you do not lock her down ASAP then there is a big chance she will bang someone else..
If the other guy bangs her better than you, then it's game over.. She will settle for the bigger D
Tell her you are not happy about her talking to other dudes, as it makes you feel insecure & jealous.. Tell her here on, you need to know exactly where she is going and who she is talking to.
I would also advise you to make random calls to her phone late at night, to make sure she is home alone.
If you make it clear to her, that you love her more than anything and could not bare her sleeping with another guy.. I promise she will fall madly in love with you.
Have you thought about making her wear something like this when she goes out?
View attachment 4450
I know it's not ideal.. But it will definitely reduce the chance of her seeing other guys.
Also write her some poetry man. Good luck