My friend and my ex

A few months ago, my friend was introduced to my ex. She was introduced by some of each of our mutual acquaintances. I saw via facebook they had met. She invited me to hang out with them awhile back and also explained about not wanting to date my ex. A few weeks later, she posted on facebook about being in a relationship with my ex. She never mentioned any of it to me. A week or so later, she texted me to ask about my ex. She wanted to know if he was abusive or had issues with substance abuse. I answered her questions honestly. He isn't abusive. He does drink. I also told her about the std he has. He doesn't tell women, he didn't tell her. They split up almost immediately. I didn't tell her to make them split up, I told her because I know he doesn't tell women. The point of all of this is, I feel like she betrayed our friendship by dating him after freely telling me she didn't want to date him (I still had never asked anything about their friendship). Lately, I see her posts on facebook and feel angry toward her. I don't think I want to pursue this friendship with her any longer but I worry that I'm being overly sensitive. Should I just get over it?

Yes you should 'just get over it' !!!! He is your EX and you do not OWN him. Plus she is your friend and she did not need to ask you permission!!!!! Get over yourself...... I think it was spiteful what you did....and I think you should grow up!!! Making it all about you!!!! You do not own your friend either......