I am sorry that you're hurting, but to be honest, girls like you really do my head in. For a start, you really can't have been that in love with the guy if you weren't willing to try a relationship with a 90 minute gap. You could see each other every weekend, call and text every day, and unis have long holidays anyway. Many people make things like that work.
You also say it was more your idea, meaning he would likely have been more upset by it than you, so he'll have needed to try and get over it while just starting at uni, when he should have been having a really good time.
Then, he finally gets over it, and finds someone else, and now you want to mess with his head and break them up? That's absolutely not fair on him, and it's also not fair on the other girl. Enemies or not, we just don't do that to other girls, it's really poor behaviour to be honest.
This is what happened with my boyfriend's ex when we got together. She said she didn't want them to be together, then lo and behold a few months later when he's with me and suddenly she wants him back, and starts calling and texting all the time. It really messed with his head - and mine - and rocked us badly for quite a while. We're okay now, they haven't even spoken for over a year because he stopped replying to her, but please don't hurt someone in this way.
You chose to break up with him, and no matter how much you regret that decision now, you made it, and have to live with it.