<human>: Can you condense the text into a few key points?

For a little back ground, he's 5 years older than me. We started dating when I was 18. I was never into guys really. I dated in high shool but it was more of the guys would ask me ou, we'd date, they'd realize I wasn't really into it and we'd break up. I've only dumped a guy twice but I've been dumped a number of times. I never really cared. It always went something like "you just don't put in the same effort, I hope we can still be friends" and that was that.  Then I met this guy. We dated for two years. He was my first everything, and honestly I actually cared about him. He wasn't like any of the other guys I had dated. He said I love you first, which I was used to, but I actually meant it when I said it back. I loved him. I planned on him being the one. And from what he said it sounded like I would be his "one" too. But long distance came into the equation, and we grew apart. Eventually we broke up. It's been four months, and while some days I feel fine, other days, like today, I want nothing more than to talk to him. In my mind he is still the one. How do I fix that?
<bot>: I'm still stuck on my ex, I've never really had this problem with ex's before. I've always been able to bounce back quickly. How do I convince myself he wasn't the one?