Is AUTHOR wrong in the post ? POST : I had this friend, we met in nursery school when we were three and then proceeded to go to the same primary school and high school. It was when we got into high school we became very close friends. We enjoyed the same music and films, we would go on  trips to get her and we went to concerts together.
The problem was with her jealous streak. I'm not a jealous person and I enjoyed hearing stories about trip she had with other people. I first noticed this steak when I become friendly with a new girl when we were 14. At first we would all hang out together but eventually, from no where she decided that she hated this new girl, which made matters awkward but I dealt with it because I wanted to be friends with them both.
We then both moved onto sixth form colleges which were different sides of town, we managed to still keep in contact. She made new friends who I was eager to meet and vice versa. I introduced her to two of my friends. The guy she got on with, but the girl she adapted an instant dislike. I didn't think anything of it because we can't like everyone in the world, but I thought it was unfair she didn't give her a chance. 
While I was at college I was give an opportunity to work in America, so I ceased this opportunity and picked up a part time job to earn some cash for while I was out there. Because she couldn't afford this trip I was doing she would shut me down whenever I mentioned anything to do with it, which in turn stopped me talking to other friends about it because I felt as if I was showing off.
While I was over in America I had an hour every evening to Skype home and talk to my parents and friends. I would message my friends to see who was free however she never wanted to know and was quite rude to me a few times. 11 weeks pass and I hadn't spoken to her at all except from the usual 'hi how are you?' as she would answer with one word and try to shut down the conversation. 
Fast forward 3 years and I get in a relationship. My friend met my girlfriend and they got along which was great. However my girlfriend said she got weird vibes from her if I left the room.
This friend of mine started getting insanely jealous of the time my girlfriend and I spent together, I always invited her out with us but understood if she didn't want to feel like a third wheel. I started inviting other friends out with us so this wouldn't be the case. 
So recently a friend of ours got into a relationship with a guy who the jealous friend already knew. She said he's not nice and warned the girl getting into the relationship with Him about him. So this girl didn't take the advice and the jealous friend got really uptight about it. So I tried to explain it was nice you warned her however it was advice and sadly she didn't take it, but that wasn't anything personal.
Trying to hang out with my friends became insanely hard as we had to work everything around her. If we invited her and she was busy she would get mad if we all still hung out. So in the end we decided to just do something even though she was busy and she's ignored us all since.
I guess I probably done things wrong that I can't pinpoint none of us are perfect! I suppose I feel bad as we've known eachother so long.


TLDR; I had this friend who would dislike most of my friends I introduced her too. She would get jealous of things I would do. She didn't like if our friend group hung out if she was busy. We have now basically ghosted eachother.  