Define your relationship as a friendship from the start. In any relationship, cross-gender friendships included,
communication is key. Presumptions can lead to broken friendships, misunderstandings, and other problems down the line. Egos aside, address why you both want to be just friends. There's a period in every opposite sex
friendship that you question whether or not you should be more. Address it early on. Both of you must want a strictly platonic friendship and understand that's all it will ever be. No matter what anyone says, it is possible to be just friends as long as you have that understanding (and a commitment to the friendship as just that) from the start.