My ex lied to me all through our 1yr relationship, he was talking to his “best friend” he met around the same time he and i met and directly admitted on live how he was always in love with her, always tried to take a route into spending more time with her than with anyone else, how he considered everyone else he’s dated just a quick thing or even a fling and quote “truly considered she was his one and only Soulmate, from his heart of hearts”, All the time he was dating me;
We broke up once, he moped to me how sad and regretful he felt for breaking up with me for a full month, even mentioned how much he loved me, i gave in and gave him a second chance, Just so he could use me for a week and jumped straight back with his little friend, ghosting me during a HORRIBLE time at that moment outside that second breakup all over again.

I believe they broke contact, and after that he went through a deep depression he tried dragging me into with.

Almost a year now, he seems to be finally stable with someone new, altho very very similar to me as a bunch of shared friends have told me.
And i feel like an awful person, i probably am, but i sometimes still feel the urge or the little tingling feeling of DMing his new girl and warn her about the high chances of him doing the same he did to me, if ever there was the chance they get back in contact, in other words as to not be a hypocrite, i almost want to sabotage him, as revenge of the miserable pain he caused to me and a bunch of other girls too.

As horrible as it sounds, i still wish him all the pain he caused me, i hope he suffers the heart break of someone playing with his heart.