I like a girl but I already have a girlfriend. What should I do?

This time u want to be friends with her,once u'll be friends with her u will try to get close with her and so proposal and all.why do u want to cheat ur gf,,u will find many a people in ur life who will carry some kinda qualities ,so u cant think to be friends with each people rite??and more over u dont even know whether she is single .Dont think about her,she is just an air bubble u will forget her once u will done with ur exams.U have a girl think for her what if she catches u,do u want to break her heart just fir a silly reason.Every one has some kind of good qualities and bad qualities.the girl whom u r thinking about may have some bad qualities and ur gf may have some good qualities.No one can carry only good qualities we are human beings not God.Be happy with ur Girl