There are a lot of people here who have written and asked similar questions... have a good look around. Do a tag search on jealousy, and anything else that interests you..
not everyone agrees that "friends with benefits" or "intimate friends" is poly, but a lot do. Get to know what the theory is so that you can be educated. Find out what you need to have as far as boundaries go and what you want from this relationship. This will help so you can start working towards that with her, or anyone else you think would suit you. Remember to be honest with yourself and then with her... and keep your mind open to possibility... this would be my advice.
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