I just got out a a bad relationship (with a friend)?

I was best friends with this girl for 2 a bit over years. We met freshman year because we were both new, and she was talking to a group of other new people so I introduced myself. For the past year, she has constantly undermined me. She would constantly disagree with stuff that I said and have to be right about everything. I was definitely in a rut and had low self-esteem for a while. About a month ago, I stood up to her when she brought me down. She flipped out, and we both ended up appologizing. This happened a few more times until finally this week, I decided not to hang out with her because these arguments were going nowhere. It was an unhealthy friendship because honestly I didn't have a lot of other friends. We hung out with her friends, who I didn't particularly care for. People thought of us as one person (I felt like I was leeching off of her), and she would put me down in front of other people so they didn't really like me unless we talked one on one which wasn't often. This week, I don't know if it's a coincidence, but I've talked to more people than ever before! I'm more confident, but I'm just not used to not being in such a close friendship. I know it's for the best, and I've been hanging out with a new group of people but it's just so weird because I feel like we were never friends at all, yet also that there's a huge gap! Did I make the right decision?