R&R fight/break up. What are your opinions? Did Rachel have the right to be upset? or was Ross Justified? Were they on a "break"?

I'll try and make this brief. Rachel was the one who said they should take a break. Rachel was the one who said that they had broken up the next morning. Rachel was the on who rejected Ross for weeks when working (I understand her job was important to her, BUT she could have made more of an effort to be with him a little more, especially on their anniversary). In addition, Rachel decided to hang out with Mark even though she was aware of Ross' insecurities. This meant that when Ross did what he did, he was angry at Rachel for going to Mark so soon after their relationship ended (an error in judgement, but with the insecurities Rachel knew he had she could have been more tactful). He was also drunk, and he had no reason not to, as they were both of the opinion that they had broken up. To conclude, Ross' timing was very poor, and he could also have done with being more tactful, but in terms of whether or not they were on a break (/broken up), I see no debate to be had. This means Rachel had little reason to be so angry, and by extension, had ABSOLUTELY no reason to drag it out for so long.