You should be friends with anyone whose friendship you find valuable and fulfilling. Girl, guy, antelope....doesn't matter. Friends will take care of you when you're down, advise you when you're confused, and contribute to your life in a myriad of other ways. Girls are great for that.
Just don't settle for friendship when you know it will not satisfy your desire for the other person.
Just don't settle for friendship when you know it will not satisfy your desire for the other person.