Should I be upset that my cousin chose another family member over myself?

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A female cousin and myself had a major blow out at the end of last year. Basically her boyfriend told her all these lies about her family being against her and with out even finding out if any of what he was saying was true, she disowned quite a few of us. He's one of those controlling types. It's obvious she's in an unhealthy relationship but whatever, she's grown and ultimately it's her choice. Okay long story short, she and I were raised together but never hung out with eachother or the same type of people. I always called her my number one hater because that what she would do. Constantly hate on me but because we are family, I always showed her love and was always good to her despite all the reckless talking she's done behind my back about me. Well this time she took it to another level. I am pregnant with my first child and after her boyfriend made up all these lies, she went around telling people how i'm lucky i'm pregnant because if not she would beat my a$$! No sweety i'm blessed, not lucky! Needless to say i want nothing to do with her. She took it to another level and i just choose not to bring my daughter around all that hate. So i'm okay with us no longer speaking. Anyway recently my male cousin was having a get together at his house. To my surprise he calls me and tells me how sheis coming and said if i was going to be there then she wouldn't show. He goes on to say how he doesn't want to be in the middle and he feels bad about it, but i can't go! I didn't trip over the phone. I told him i understood and i didn't want him to feel bad because that whole situation had nothing to do with him. My feelings were hurt though. I felt like if he didn't want to get caught up in the middle then why put himself there? I think he handled it wrong. As soon as she said well if she goes then i won't, what he should've said was - that is between ya'll and i have nothing to do with it. I'm not going to tell her that she can't come because you guys have issues. My home is welcomed to all those i love and you guys need to figure it out. I think that would've been the right thing to do. Does anyone agree with that?