I need help as I am baffled with a 20yr Korean recently-Christian student girl.

I started having an obsession with Korean girls recently, and been going out trying to meet them. I met a few but one stood out. Upon first meet she seemed interested in me, we went for korean dinner & drank soju together, with scouting for desert afterwards. She said we can do a weekly language exchange.

Met her again the next week for a quick language exchange. Then dinner, soju, and scouting for deserts again. Similar pattern to previous week.

We're always texting each other with fun long messages so I can see some good investment going on.

Next week we meet again for quick language exchange, dinner, soju. Plus I asked her to go on a big date that Saturday. She is looking forward to it.

I been developing one-itis on her and started getting frustrated with my feelings.
Thursday night I stupidly posted a message on my Facebook wall along the lines off: "Do you think of me as a friend? Hurt, etc." The following day her messages were short & cold. I immediately deleted my wall post thinking it was stupid of me.
That night ended up at night club where she was "leaving party for another friend". She seemed happy. Did shot routine and got kiss & kiss back. Afterwards holding hands.

Next day (Sat), is the big date. Upon meeting point, everything looks fine. Wasn't sure what to expect, but she came to grab my hand, and we ended walking holding hands all day. Took her to lots of romantic places which she was awed/wooed by, ending with romantic French restaurant, and night club (where my friends were having joint bday party). Everything seemed good & happy for her, enjoying herself and always smiling at me. 3 jager bombs, 1 tequilla each later, I took her back to my place to show her a film. Now this is when I know I messed up big time. I was engrossed in the film rather than her! She began falling asleep. At end of film I took her to my bed only to see her really worried face saying to me "all I just want to do is sleep". Whole night couldn't sleep to do the jager bombs, but I just cuddled & hugged her while she slept.

Morning after, looks like she's hangover (headache). Though she never spoke, I get the feeling she's going through buyer's remorse (my guess!). Though throughout day I took her to an hindu exhibition, and we were still holding hands somewhat, but I could feel it's weakening, not much reciprocated, ie going for a hand hold in the car whilst driving, but she's very passive.
End of day, decided to take her home early, and one last quick kiss.

Monday, cold, very short replies, no investment.
Tuesday, same, and so forth....

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Anyone got any analyse/insights to help me?