He is dealing with personal issues
While it might be odd to think of men as anything other than superheroes, knights in shining armor, or Batman-like dark knights without a need for emotions, we know that is a lie. Men and women both have emotional baggage and issues from their past that continue to haunt them.
Just like how you might have separated from relationships in the past because something causes an old scar on your heart to throb, he might have felt the need to do the same. While you may be thinking that you could have helped, let me say this: Not all inner battles can be won by relying on someone else.
You saw him as an idea or object
Gasp! Sorry, ladies, as much as I am a feminist, we also sexualize and reduce men to objects from time-to-time. Before your start angrily shaking your fist at me, let me explain.
Does this sound familiar? During the first few dates, the two of you hit it off really well. You enjoy the complimentary drinks, despite offering to go Dutch. Then around the sixth time you meet up, you find yourself expecting things instead of enjoying him.
Additionally, you are fantasizing about the possibilities of where the two of you will go together. But you no longer see the person in front of you. Rather he is now the ship that sails you to the future.