Yes, that's why felt too sudden. They aren't even on good talking terms let alone getting to know one another properly.
The promo was really cute though. But I would've liked it, had they gone there taking their own sweet time.
Sometimes the speed of falling in love in other shows bothers me. But I don't know.. here I think its fine. Its a teenage love. You start liking someone, you feel attracted to them. As you start dating them, the love and friendship both grow. Honestly I feel like I'd rather them start the love track and have them give enough time ti watch their relationship grow than wait for them to become closer friends first.