Me and my ex are both 19, we met online and then real life, where most of the feelings developed, shortly after that, we took each other's virginity. After about ~4 months of daily texting, meeting with each other, (I go to a university, she works as a hair stylist) she simply told me, that she doesn't love me anymore. I was devastated, went and cried to her, without an ounce of reaction on her face. It's been a week now, I've tried talking to her 3 different times now with no good results. I gave up on finding anything salvageable, but I'd be glad to read some advice on here.
Ok, this is what I would actually do (#1, 1.1 and 1.2 is what I would do if I was your friend, not you, but you can also do it.)
0, straight up tell her how terrible she is with total confidence. A real rebuke can have a mighty amount of psy-damage (insert "Emotional Damage" meme)
1, puncture her tires' side walls. Give her 4 big ol' flats.
1.1 steal her car battery if possible, don't break in though, only if its unlocked. This way when the tires are replaced and someone goes to start it, it'll be another hour or two before the car is running again. Double whammy
1.2, if she lives alone, sneak into her place while she's at work and turn everything on. I mean EVERYTHING. Turn on all lights and faucets (make sure the drains do drain lol, and use the HOT water), washer, dryer, turn on the AC or Heat, whichever is most expensive. Open all windows. Leave the doors closed so no one investigates while she's working. Turn on the TV and let it run. All the ceiling and standing fans too. Everything that draws power, turn it on.
2, Tell her you'll beat her up if she ever fucks with you again.
3, get shredded to spite her and post it online, so she will both be physically attracted to you and become more and more scared of you, this contradiction will drive her insane.
4, garner female attraction and post it online. Go on dates and take selfies with them etc. This is much easier when your goal is not success with the woman but forcing the lesson onto that bitch.
5, Find the richest guy you know and hang out with him, do something fun and post that online as well, this way she knows how retarded she is on all 3 attractiveness fronts.
6, shit talk her at every opportunity. Warn people about her if they know her.
7, if you can, date her friends. If you take them to bed, tell them something like "I want to do something more with you, not just pump and dump like I did with whatsherface, you're too pretty/funny/nice/cute/fun/etc for that."
Women gossip and that will fuck her up.
So ask yourself, is this evil? Let me just tell you that no, it's not. However she is, obviously, from her behavior. And evil behavior requires righteous, just and brutal reactions. So I suggest you find a way to make these things happen.