You're allowed to change your mind. After all, sexuality is fluid, as they say, and it's no one's business but your own.

[Just a little, she squeezes Rei around the shoulder reassuringly.]

And as for why you're so head over heels, well. [A quiet laugh.] That's the honeymoon stage! It's easy to get so passionate when you're just starting out and learning everything about the other person. If you two decide to stay together, it'll shimmer down most likely.