>>100406340She didn't really like Shaggy she just liked the idea of Shaggy. Think about it, other than solving mysteries together the two really have nothing in common. She wanted Shaggy to be something that he wasn't. That isn't to say there's nothing to like about Shaggy. The guy is tall, trustworthy, very kind and generally pleasant to be around. It's just that the two wouldn't really make a good couple and they both seem to realize this by the time their relationship came to an end.
>>100406439Yeah the whole Scooby acting like a cockblocking asshole really was a bit odd. He was written like a needy bitch who couldn't stand Shaggy spending any alone time with anyone else. He should have been written as a bro that helped Shaggy score and the relationship trouble would have felt more natural if it had come from some other source, like the aforementioned general romantic incompatibility.