Right now AJ's past & gulit of Antra's death is holding him back from admitting to himself that he cares about Guddan and she is his wife. Deep down AJ has the fear of falling in love & losing Guddan.
But I love how he was questioning, asking his heart & mind why he couldn't accept and admit the truth that Guddan is his Wife.Since Angad is his brother, it was okay for him to say & reminded Angad that Guddan Akshat Jindal is your Elder Bhai's Patni & Your Bhabhi. AJ was reminding Angad who Guddan is in realtionship.