Please Help!!! Question About A Korean Girl?

I met a Korean girl about a year ago while she was on vacation in the U.S. We talked and it was really good (we were ONLY friends). By the time i told her i liked her, she already met and gained a boyfriend, so i gave her space and we didnt talk too often after that. Just recently i got back in contact with her and i took a trip to Korea (not to see her, but for work) but we met up and she showed me around. on the first night she held my hand and came back to my hotel room with me. we didnt have sex, just kind of messed around. we hung out every single day after that (4 days) and i loved every second of it and she seemed like she did too. my question is, now im back in the U.S. and she’s still in Korea, but she’s saying she wants to move here and marry me. Is this common? Could she really love me that much after our short time as person-to-person? Is she using me? Please help, im really confused and i really care for her, but i dont want to make a bad decision if she’s using me. Thanks!!