A friend of mine stayed with his girlfriend throughout uni and they're now married, although they did speak on the phone at 6pm every day, regardless of where he was or what he was doing.
When I went to uni I split up with my girlfriend but kept in touch as we had several mutual friends at home, then one day after uni I was on a drunken tour of the country (visiting as many random people as I could, while trying to put off getting a proper job) and ended up getting together with the ex, 5years later, we're now married.
These two stories do seem to be the exception rather than the norms so don’t hold your breath!