When I was in undergrad, I met a grad student from a different school. He was just about to graduate; I had two more years left.
There was another girl in my major who was also doing a long-distance relationship with a guy from her old hometown. He was a teacher (her old high school teacher?) and they had begun dating when she graduated high school, and there wasn’t a conflict anymore.
My long-distance relationship survived. He had a hobby that required a lot of travel. So during the summer, I’d meet up with him at events that he had obligations at, and we’d get to be together. During the school year, we would still try to get together once a month, perhaps, but not as often as I would have liked. But I had my job; and he had his job; and even though it was back in the day when gas was 80 or 90 cents/gallon, neither of us had a whole lot of spare money for extra travel. We made up for the difference with love letters (on paper! with stamps!) and emails and phone calls. The letters were nice— I still have his and mine both. They were a good way to put things down on paper, and show that we could connect two thoughts together into ideas, and let a little humor and personality shine through.

And you can re-read and linger over a letter way better than you can re-read and linger over a text.
My friend… her teacher boyfriend didn’t end up waiting for her to finish school. I think he ended up finding someone else to see by her sophomore or junior year.
We met in April of my sophomore year and started dating that summer. I graduated in May. He proposed in July. We were married in November. Our marriage isn’t old enough to vote yet… but it’s old enough to drive.
All that said, I would be very, very, very, very leery about committing myself to anyone that I’ve never actually met in person. And even if I had met them in person, I’d be very, very, very, very cautious about accepting them for who they say they are without any context or proof… because you run into so many people who turn out to be the “other woman” who have no clue about the rest of the guy’s life. I was on a pregnancy forum whenever I was expecting my own children, and there was always at least one or two women in my due-date month who were devastated that the guy they were having a child with wasn’t the kind of guy he had presented himself as, and had no interest in being involved with his new family.