YG essentially replaced 2ne1 completely with BP, he gave them every privilege that he didn't give BP (still not a lot). constantly compared them at debut and called them "pretty version of 2ne1", in what scenario would these 2 groups have a good relationship? whilst CL was begging YG to release her music he was busy releasing BP music.
i won't even mention the amount of shit CL was getting from jennie stans about how much better jennie is then her and other disrespectful shit