Long distance relationships are not bad. U just need to understand certain things and a great deal of commitment
If your friend loves this guy as much as u said she does, then I think she should tell him. Because if your friend were to be in the same position as the guy right now, she wouldn't like the treatment that she's giving.
Your friend shouldn't be worried about long distance because before this guy met with your friend, he probally knows that they both will be in a different country.
The reason y he must be asking her if she loves him is because he likes to hear when she say it or she never told him anything.
All I have to say is your friend should give him a chance because she never knows until she tries. Besides she has noting to lose.
she should tell him before he gets tired of waiting and move on.
Best of luck to your friend😊