When Should You Stop Being Friends?

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My old friend called yesterday. All she wanted to tell me was to call my ex-boyfriend that she slept with while she was engaged to her husband, but not while the guy and I were dating. I have these huge feelings of resentment towards her because of it. She knew how I felt about him. She had to. I just don't know. Maybe I should just give up. She also just recently crashed her car into a diebold truck and won a million dollars in a law suit. I don't know if this was true, but she has a big, blue house now. I don't want to be her, but it is hard not to be jealous of someone who has a bigger house, better job, a million dollars, and a nicer car. She quit calling me for like a year when she won the money, even though we were "best friends" before that. I ran out of money, so she ran out of time. I am so bitter, but I can't say it is all her fault. Every time she calls, I feel like such a failure that I want to cry. I cannot allow someone to upset me this much, but she has everything, and I am single forever with my little apartment, and usually when she calls, it is to rub this guy that she slept with in my face. Why are they still talking at all? She is still married to her husband, who I am not supposed to tell! Should I stop being friends with her?