LOVe question! What's REALLY going here??? WHat should I do?

I could really use help here! I'm 23, she's 21, I'm itallian, she's black, were both very attractive people (she's gorgeous, vey exotic, very dark skined, just beautiful, like an angel) We've known each other for 5 years. and have been fast friends from the beginning. We have a lot of friends a lot of the same friends 2. But she's my best friend! Even our parents love each other. 8 mo. ago I decids 2 move out and she already did she had a nice 2 bedroom apt. And she asked me 2 move in...So 4 8 moths we been having ... A LOT of !!! A least twice a day, on weekends we order pizza and do nothing but that all weekend long! We've even made a home video! But, she has made it a point that NO ONE can know about it not our parents, not our friends, NO ONE! She dosen't want a relationship! her plan is to just have our fun now and eventually marry other people. But thats not what I want! what can I do! She will NOT TALK about it and if I push it I could lose what I have NOW