strangest thing happened today

🍎 • 💍 💑 ..due September 4th 💙💙
So there's this guy on my fb ....an ex coworker who's been having issues with his ex girlfriend/ girlfriend ....last month he posted that he felt like she doesn't love him and that she up and left with their daughter without even telling him *they've been together for 7 years ..I know her too* ....I commented on his post giving him advice, then he proceeds to tell me what's been going on. Two days ago he made another post saying she's been cheating on him and that she left him for another guy and how they we're suppose to have another kid and get engaged ....so again I commented like any caring person would *mind you I wasn't the only person who did this* ....so anyway I said my peice and his sister commented *she doesn't even like his ex gf/ gf" I agreed with what she was saying. Then boom his ex gf/ gf comments *from someone else's profile* going ballistic on me telling me to mind my buisness and to stfu she even went as far and lied saying how I've been trying to mess with him which is a complete lie and she knows that ....also calling my marriage fake which it clearly isn't, when I got married on tv she was the first one to post it on her wall 😑🙄. I've never had any issues with her and literally all I did was give him advice like everyone else did ....I was the ONLY one she said something to ....🤔 I wonder why 
*EDIT* I would just like to point out that I wasn't upset that she said something even though I found it odd but what bothered me was the fact that she sat up there and lied ....I don't like to be lied on especially on something like that