WHY DO I WANT HIM

Well I'm a freshman in high school and I have a beautiful girlfriend whom I love to death, I'd do anything for her. But one her guy friends, named Cole, is gay. It doesn't bother me. But lately I've been seeing him as a little more than my girlfriend's gbf. I know that Cole is a virgin and that he's kinda prude and I just want to take away his virginity and steal that away from him. I want to kiss hi but I kind of want him to stay away from anyone else. My girlfriend told that a friend of mine, Jordan, likes Cole and is thinking about asking him out. I don't want Cole with Jordan, and I really don't want him with anyone else but me. What do I do?