<human>: Can you give me a shortened version of the text?

My good friend decided to hookup/date my ex a few weeks after we broke up. I broke up with her because I didn't see it working out in the long run, and didn't want to let something I didn't see long term continue after a month and a half. Apparently, some of friends knew, but no one told me they were doing stuff. My friend had to tell me that she saw both of them together in a dining hall and his neck was covered in hickies. I asked 2 of my friends, and they knew.

He has little/zero experience dating anyone, and she was pretty mad about the breakup.

Do I have the right to be mad, or should I just get over myself?
<bot>: Friend is hooking up/dating my ex, but never told me. Do I have the right to be mad?