Remarriage & Desires

I don't understand the FL at all. in ep5 she thinks about the things her own husband of 15years did behind her back w another women and then says the women is the devil. like gurl💀like obviously she's at wrong but the FL literally doesn't care her husband brought that upon himself. he couldn't even apologize he only did it when the his affair betrayed him so he had nowhere else to run to but the FL. YET the FL is crying and taking "revenge" for her cheating husband. like it takes two to tango. if he could throw away his marriage of 15years for another women I don't think you should be doing all that for him. FL keeps saying yoohee took everything from her when in reality it was all her husband that put her in this. the male characters have no depth at all idek where this is going