Its a bit tricky, as roof says no one really like the thought of their GF with another bloke, there will always be that nagging doubt, however innocent it is.
If you try and make the girl choose between you and the BF chances are you will lose so theres no point in pushing it.
If you really want to keep her as a platonic friend then you need to make an effort with him, even jus token gestures!!
Softly softly catchy monkey!!
im not making her choose, but he wont let her see any male friend...not just me. is that not controlling? or am i talking to the wrong group of people

nope im not trying to get in her pants
For sixteen year olds that would be a totally diffrent answer
ahh the joys of being young, although im not actually that old. lol. in a few years you will find out that cuddles and friendship with le ladies is more important then someone to sleep with, yeah it doesnt look quite so good to your mates down the pub. but i dont care! love live the cuddle!