Not sure if this has been brought up, so yeah

I just finished watching "I Robot, You Jane" on FX. At the very end Buffy says something like "Let's face it, our love lives are doomed!" They all start cracking up and then realize what this potentially means....
So my question is: Has this always been Joss's master plan, even as early as S1??
I mean look at Buffy, she had to kill angel, scott broke up with her, Angel left her, Riley left her, spike was violent and even tried to rape her, etc.
Willow, she loved Xander, but he didn't love her. Oz left her, Tara left her (understandibly), and was eventually murdered.
Xander had a tendency to fall for demons, him and Anya couldn't work either....
I mean even Spike, Dawn, and Joyce had romance problems....
Me thinks: Joss sucks! (in a good way

)