Bohut Miya and Biwi are Possessive for eachother
Both dont want eachother to get harm, in trouble or risking their life.I am assuming that Antara was insecure of the bond between AJ & his brother, or Angad & Antara didnt make a bond of Devar-Bhabhi, like one dislike the other.Here Guddan is going to make a bond with her Devar and win his trust, also melt the heart of AJ, show him what trust and care is all about.I think this is the major difference between Antra and Guddan, Antara seemed perfect but she wasn't but her Guddan is imperfect, she learns from her mistake, improves and understands situation & people better which makes her Perfect for AJ.