How do I get over my crush?

So I like this girl let's call her Abbie. Abbie and I use to be really close friends but ever since she got with her jerky bf and after we had lived together for a short period time things have gone downhill. We are both girls and we are both bisexual so that isn't the problem. The problem is that Abbie won't talk to me anymore and I don't know why. I currently am living with my brother and he is dating her best friend so that makes me feel really uncomfortable. I feel nasecous and sick cuz I'm worried they are all hanging out and not including me. I never told Abbie I liked her but she might still know. When she did talk to me beforehand she would make fun of me a lot and call me stupid. I have made a lot of friends since then and they all say she's not worth it. No mean answers please.