This sounds so farmiliar. I have two guy friends here in Shanghai have both come across the exact same situation like you do 🙂
One is English and one is Swedish. All met their Chinese girlfriends thru internet and started to communicate with her sort-of broken English. And both guys later found out that they actually had a boyfriend when they started to date. Then both girls acclaimed that they were fighting everyday, blahblahblah.
Well, I’m sorry but it just sounds such a cliche to me. Although I’m Chinese myself, it’s true that there’re certain types of Chinese girls that are easily to get, however, I think this does happen in every country just not as much as in China.