Don't overly idealize the relationship you had in the past. If you do, nothing will live up to it. Had it endured, it would not have been perfect, either. You have some good memories of the guy, but he wasn't who you needed at the time, so it ended. Maybe you mistreated him. Couples survive problems like that. You and he didn't. Put him in your past where he belongs. No future relationship will be ideal either. You'll get close to someone, if being close is what you value.