*For the sake of names and stuff I will be using fake names for the people in this story*

Can anyone give me some advice? So Jill and I have been friends for almost 3 years and she was one if my closest friends. She has a brother and two soon to be step brothers. In December of 2017 I dated one if her soon to be step brothers Bob and it lasted a month and then we broke up. Later on in September of 2018 he brother Jack asked me to Homecoming as friends and I said yes to go as friends. Later on in October her other soon to be step brother Cole asked me out and I said yes because I fell in love with him during the summertime. Now Jill never had an issue when Bob and I dated and when Jack and I went to Homecoming and when she found out Jack likes me more than a friend she didn't make a huge deal about it. Then, when Cole and I started dating she made a huge deal about it and said that I was gonna turn into my sister and use Jill to go over to her house to see Cole.

I don't know what to do cause she also told her mom a bunch of lies about me and she doesn't really like me anymore and she has been talking crap about me and she used to be one if my best friends should I drop he completely or should I stay friends with her? Also do y'all have any advice for this whole mess?