Robb Stark
King in the North
I don't believe, at all, that it has ever been the intention of the producers of Buffy to portray Buffy/Angel as something planned or sinister.
I'm going by the series here (and I'm about halfway through S8, so I am reading the comics), but Whistler guided Angel towards Buffy to protect and help her, not for them to sleep together. If I'm remembering correctly, the whole thing revolved around a prophecy regarding Acathla, which ultimately came to pass when Angel lost his soul.
Plus, going from commentaries from Joss Whedon, namely the "Chosen" one, he's spoken about how Buffy/Angel is an important romance, as have a number of the actors. Also, going from what @Janos said, there was nothing plotted to have them fall for one another either.
I'm going by the series here (and I'm about halfway through S8, so I am reading the comics), but Whistler guided Angel towards Buffy to protect and help her, not for them to sleep together. If I'm remembering correctly, the whole thing revolved around a prophecy regarding Acathla, which ultimately came to pass when Angel lost his soul.
Plus, going from commentaries from Joss Whedon, namely the "Chosen" one, he's spoken about how Buffy/Angel is an important romance, as have a number of the actors. Also, going from what @Janos said, there was nothing plotted to have them fall for one another either.
Kean
In the most basic terms: they were meant to meet each other, even aid each other in battle, but falling in love was not planed or foreseen. No act of God made it so, they just did, inexplicably. Like all great love stories.