It's not this, in this Justin basically goes away for school.
In the one I'm looking for he leave town to get away from Brian and starts a very successfull business, but he's ill with something affecting his nerves I think. He kept in touch with someone from the gang, I remember Emmett but can't remember if anyone other than him.
Brian get to know about him by accident, probably some years had passed from the last time he saw Justin.....

Thanks anyway