I find it very strange how strongly you speak of love when you yourself don't believe in it.
That's not a love. That's lust, pure, unadulterated lust. Erik's seduction caused her to lean to him, want him. With Raoul, it's a completely different story. It's a childhood love, a love that they grew together. She's not scared of Raoul - and yet, with Erik, she has reason to be freaked out by him. She even says this:
Those eyes, that both threaten and adore.
And I'll come to admit that it's highly likely that Erik may have had fallen in love with her, but Christine? Natch.