So my ex and i were on and off to 2 years. I recently broke up with her a month ago and found out a couple weeks ago that she had been hooking up with the dude she cheated on me with (ik im stupid for taking her back) raw behind my back for a whole year AND had 2 pregnancies behind my back. When i found out, i called her and confronted her about it going off saying shes gross and that i couldve literally caught an STD. she kept saying its none of my business but it literally is because while shes hooking up with a random raw, shes also being intimate with me. I ended up crashing out that day and exposed her on social media. A couple days later, her ex that she was trying to get back with found it and confronted her about it and she immediately went crazy (as shown in the picture) she was spam calling me 45 times, threatening me, harassing me, calling me mean things, sending hateful paragraphs and even gave out my number to her other friend to also harass me. Shes making me feel like i have no right to be mad about the situation man. I know i shouldnt have went on social media but my feelings were crazy hurt atm and i feel like everyone deserved to know the type of gross evil person she is. shes literally mad at the world but herself. Do you guys think i was overreacting? like i dont understand why shes being so mean and cold to me like she didnt do me the most horrible way. No apologies or nothing. I havent stalked her socials since (its been a week since this happened).And i cut all access. I just dont know if i should change my number, because i dont want to change it if this will be the last time i hear from her. 

How do i handle my crazy ex in this situation?