I want to propose but dont know how???

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Hey guys I met a girl two years back on yahoo chat today we share a lot of things we know almost everything about each other. I am not sure whether she loves me or even thinks about me the way I do. But I am going crazy about her. The biggest part of the whole issue is that we have never met or seen each other. But that is not a priority for me. Tell me how can I get to know how she feels about me and how can I propose her.