What should I do now? I'm just stuck in this prob.?

Ahh this is a kinda long story. I'm Cerise Chanel from France. I went to USA to study at the University of UC last year. Well... 4 months ago I met a guy named Brett(who exactly looks like Logan Lerman) at the school party. I felt really lonely coz I didn't have many friends here, then I saw him. He was alone too, I guess. So I talked to him. He told me that he just didn't fit here, and I asked him out for some air. Then he asked if I wanted to travel a lil bit in his car, so I followed him. He drove me to a river, we sat and talked for an hour. Suddenly, he took my hand and we jumped in the water. That was CRAZY!!!!! But 'was fun anyway. And after that, we kissed. You know...crazily, deeply.... That night he took me to his apartment and we slept together. That was the first time I'd ever done it. We've been living in his house for 3 months. But last week my dad called me and said he wanted me to come back to France to marry a totally strange man! What should I do now? Everytime I tried to explain to Brett, he just held me tight and said "Please don't go". My dad is a scary man, but I love Brett truly. What should I do now?