On Buffy the Vampire Slayer, Buffy and Spike find they are pulled together by love. They don’t want to love each other at first, but they can’t contain their feelings and are drawn to each other. Buffy, of course, fights her feelings every step of the way. She resists her own feelings of love in this little bit of dialogue:

BUFFY: I'm not saying I don't have feelings for you. I do. But it's not love. I could never trust you enough for it to become that.

SPIKE: Trust is for old marrieds, Buffy. Great love is wild and passionate and dangerous. It burns and consumes.

BUFFY: Until there's nothing left. That kind of love doesn't last.

And in fiction that kind of love ends tragically. Perhaps it is also true in life.