I guess I got a little carried away...

Anyway, I think that Spikes love for Buffy is just so strong that I haven't ever seen anything else like it. Even if she didn't love him nearly as much as he loved her.

Easy question =D I have a few runners up though...
Tara's love for Willow & Willow's love for Tara
Angel's love for Cordy & Cordy's love for Angel
Xander's love for Anya & Anya's love for Xander
Also Oz's love for Willow
And even though they're not up there... Wesley and Fred's love for each other.
Oh, and of course Buffy's love for Spike is up there too :)

For the ones who truly love the other, I don't think their love should be quantified. Everybody loves in different ways, but that doesn't they love any more or any less than somebody else does.

It is too hard to choose.
I hesitate too much so I can not pick anything ^^

i think this is more obessive than anything else...but i agree with acklesgirl, that these couples loved each other at one point or another and their love for each other cant really be labelled as such as they had impacts on each other at one point or another...sure have your favourites thats cool, but i like them all cuz all were entertaining :)

And vice-versa!