<human>: Condense the text into a few key points

Me (21) and this guy (31) were casually hooking up for about a year (I'd stay over once a week, we would see movies sometimes, just hang out, sex, etc.) His ex of 3.5 years came back for vacation for a week and he said the way he ended things with her was really wrong, so he met with her to make things right and ended up getting back together. He continued her vacation with her in another state. He came back Monday and just told me today he quit his job and is moving across the country. She's moving from out of the country to be with him.

It's all so sudden. I can't help but feel saddened over the fact that I'll never see him again. Obviously what they have is real if they both can drop everything to be with each other after 3.5 years of no contact. It's really eating away at me that they're going to inevitably get married and have kids (based on their ages). He's really gone forever. I understand we weren't boyfriend/girlfriend. But I genuinely cared about him. How do I cope with this? Really I just would like for someone to talk with me. I've talked all my friends ears off. They're tired of hearing about it.
<bot>: Guy I was seeing reconciled with ex and suddenly decided to move across the country to be with her. Please I just need someone to talk to.