My friend is being mean to almost the hole friend group why?

Ok we all been friends for almost 2 years so all six of us went out last weekend to eat so when we got our drinks my friend went off on her boyfriend out of nowhere something about why he has to tex his mom what he is doing ever minute and why she can’t come over the next day than it was ok till appetizer. Came out she almost jumped over the table at our friend that she knew way longer than anyone else about him not having a girlfriend and having two jobs than she calmed down than she got a call from our other friend who came late than she yealled in the phone like you should of told us earlier we would of waited to order than hung up she was like we have to wait after we eat than food came she throw her spoon at my boyfriend because he was on his phone the entire time than our friend gets thair eats than we go to bath and body works than quietly says to me you should stop fooling around with Murray I know George dosent touch you anymore but you acting like he not good enough than we waiting for our friends mother to come get her and she than almost knocked me down Yelling at me that I never do anything or pay for anything when we hangout and than she and her boyfriend left I was close to tears I told my friends mother what happened and said I baked a cake for Murray 2 years ago and I brought his cake last year I always pay for the pizza I brought her a cake for her birthday she only paid once’s whe we wear at her house and I always make plans so we see everyone what’s her problem

My friend is being mean to almost the hole friend group why?
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