He ran because he realized she was awake. If he cared about Abhira he'd not hesitate in such a situation where she was in danger to say "yes she is my wife" to Ruhi too. He'd not look guilty about being in bed with Abhira but would be concerned about Abhiras health. The fact that he's still tuned to Ruhis discomfort and wants to placate her speaks about who and what his priorities are.
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