Choice between two people

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I accidentally stumbled into an online relationship maybe half a year ago. We've been friends for nearly 5 years. We understand each other well, enough to always know the best ways to ease the others worries and turn each other on. But we are also kind of codependent, barely functioning before the other came around. We'd probably do well together but it'll be a bitch to move there.

And I recently made a friend from a local group of mine in town. We're both nerdy as all get out and I like her, but I feel devoted to the first girl. We both definitely have attraction to each other, but I'm scared the first girl may not function well without me now, as arrogant as that sounds.
I wish there were two of me.

Any advice?
Pic ironically related.