Is this even a relationship?

My sister has been in a long distance relationship due to Covid and visa problems. She has seen her boyfriend 3 times in 3 years. She visited him after nearly 2 years and then saw him again 6 months later and then again 6 months later. They will be together next year but would you even call this a relationship? They were with eachother for 5 months before the distance. Im just afraid that her boyfriend is cheating or something. Like even the most loyal guy would struggle with that distance and lack of intimacy. What do you think?

Is this even a relationship?
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