Hi Sarah,
When he was acting really friendly, eager and outgoing on text, he may not have been showing his true personality.
He may have felt the need to impress you over text in the hopes that he would ultimately be able to get you to meet up with him when you returned from studying overseas.
His serious nature and the fact that the meet up felt like an interview session would indicate that he no longer felt the need to pretend now that he had gotten you to meet him in real life.
During the meet up, he had a tendency of repeating a complaint because he may have narcissistic tendencies.
All of those complaints were typically focused on something that was affecting him.
He complained about his phone getting wet and his dry contacts and more.
Again, all those complaints were focused on something to do with him.
Normally, this type of behavior indicates some narcissistic tendencies or at least a personality that is somewhat self-centered.
These tendencies were also displayed in how he went about treating his meet up with you like an interview session.
Typically when a company interviews you, they are looking for how you can serve them.
The company is thinking about themselves first and foremost.
Again, this harkens back to his narcissistic or self-centered tendencies.
He wasn’t irritated by you.
He behaved the way he did because that is the type of personality he is.
He would have most likely acted in the same way with anyone else.