Emergency advice required?

So a few months ago my ex dumped me after 2 and a half years together. Today I find out that she started dating a guy who she said was just a friend. A guy who I was extremely paranoid about and told her that I was fearful and she insisted that it was nothing.

I am experiencing an incredible amount of grief and sadness. I am so upset and I want to text her and yell at her and tell her how upset I am. My friends have advised me that doing this would be a poor idea. All logic for me is out the window at this point. I don't know what to do. Help.

Emergency advice required?
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