I dunno, having been exposed to my fair share of nerds (physics nerds, no less), I can attest that Leonard's actions are actually what I've seen that type do after a breakup. Not saying that they're going for realism, or that Penny's putting up with it makes any sense, but Leonard is actually dead-on for the stereotypical physics weenie I know.
I'll still give it a chance to see how it plays out.
/tk
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