Here's "Each relationship is different<part1>".
The part 1 is categorized as "Honey", but the part 2 is "Diary". Well, no reason....
Anyway, I went to the field yesterday for Ultimate. 
I hadn't played for 5 weeks or so, so after several games, I got cramp in my calves and quit playing.
I left the field before the games were over and walked to the station with one Canadian guy. 
He has a Japanese girlfriend in the Ultimate team, but is leaving Japan in June to get PhD in New York. 
I wondered what they will do with each other when he leaves, so asked him on the way to the station.
He said he can't keep their relationship if there is no definite future plan, like she is coming to the States in 3 months or something like that is already set up.
Also, he requires her to be more independent if they live together, both financially and mentally.
She cant speak English well, so if she comes to the States, he would need to take care of her, but he will be busy with his PhD programs and his own social life, so he cant take care of everything about her.
Even though she wants to go to the States with him, she doesnt have enough English skill to get a job or to go to University and college(not ESL), nor enough experience of any profession, so she needs money to live on.
But she doesnt have that much money, either.
There's kinda nothing she can do. 
He also told me that she gets jealous over him so easily.
She doesnt like him talking to other Japanese girls who can speak English better than her.
(The interesting thing he told me is I'm an exception because I'm already engaged...
)
I dont think they trust each other completely. There is a doubt between them that they will have a new BF/GF if they are away from each other.
Especially her. She has a reputation that she is a foreigner-chaser. I'm afraid to say, it is true.
He is the sixth foreign boyfriend for her.
This reputation is well-known among us and he know that as well.
So he said either they try to keep their long distance relationship or they break up as he leaves, she will find a new foreign boyfriend, sooner or later.
She sounds like a bitch, but she is a very cute, good girl. Please dont misunderstand.
I'm so sad to hear that they have to break up even though their current relationship is so good.
I understand what he said, but when I think about me and my BF when he left here, there was no definite future plan, nor had we any idea how long we would have to wait.
He left because he had to and we kept this long distance relationship because we were inseparable. 
It was simple.
I know it is not my business, but I just hope that they will make a decision that they wont regret.