Some points on behalf of gunjan:
watching gunju that manjeet telling geet to entice a man(ballu) and settle down,her infertility,ranvi,s extra affection towards deepu,a widow with child is getting mingled with her husband beside,s she cant bear a child,seeing ranvi sleeping and changing his cloths when he is with geet alone,a family photo of geet and ranvi etc etc.
We all know these are misunderstanding bcoz we r the viewer.but in show gunju,s character is not aware of these.no matter how a woman love her hubby,but itz not easy to trust in these case,its natural.gunjan is absolutly doing the same.she is feeling insecured and threatened by geet mistakenly.so she is wanting geet married by hook or crook to save her marriage.she cant think positive for geet,bcoz she thinks geet already a villain of her life. So u can blame the situation not her.she is just acting like a insecured wife who wants to save her marriage by any means.honestly speaking ,ranvi is also responsible for gunju,s doubt.he said to gunju 'u love me then why dont u trust me?'
then if ranvi loves gunju so much then why he doesnt stay away from geet and deepu,bcoz his lady love doesnt like+insecure of their company.no matter how good person geet is,no matter how affection he has for deepu,but are they important than his own wife,s company.
So people who are bashing gunjan,please at first put yourself in her place and then bash her.if she is doing something negative then she has her some purpose.a vamp do harm without any purpose,then how can gunjun be a vamp