Hey man what I'm gonna suggest you do varries a little from the other posters, but next time you see or talk to her say hey we should whatever you think would be fun. When are you free next week? If she agrees go out have fun don't worry about labels or any of that make it your goa to just have a good time with her. It goes well rinse and repeat. You keep showing her a good time romancing her properly She'll eventually bring up being exclusive again, but you don't mention it until she does. If she gives you the ljbf say I like you I think you're a great girl, but I'm not interested in friendship I'm only interested in you romantically, but give me a call if you change your mind.
www.understandingrelationships.com check that out I'm certain you'll find it helpful.