Vic's Marriage the Wife is inconsistant

I found her character ridiculous and inconsistent. the first 2 seasons she was defending Vic no matter what. she was so casual about the hookers kid coming home never really questioned it and took is casually. just like Camila in the Sopranos. would accept that her husband does things illegally for money on the side.

then she leaves and does a runner because of something that had nothing to do with Vic at all
but constantly after that blames her marriage on other things when the reason was she ran from that incident and all of a sudden the marriage had broken down. and they turned her character into Skyler White.

I don't know why they made the sudden change with this