I am not fond of these kinds of relationships, as you have said, they often turn bad. If they turn out, all go, great, but I'm not for them. I'm the kind of person who can only like someone if I know them in person well, I need them to be there so I know what they like, how they act, how they laugh, things like that.
Unfortunately, I'm also the kind of person who thinks too much of their future and am not willing to get into short term relationships, and that makes me the odd one out in my class, being interested in girls but not having been out with one.
So online relationships can work, if they do then it's just great, amazing, good for the people who found happiness, but I would never do that kind of thing, because of the things listed above, I can make friends online, but I wouldn't want to make a relationship like that, but that's just me. I'm a weird person who's too far in the past in this sense.