The most generic and straightforward answer is that your relationship with the Western person is going to be more casual.
Let's take a look at the detailed distinctions between the relationships.
For a lot of Chinese people, serious dating starts after they’ve finished school.
Chinese dating and marriage rituals
In fact, I once dated a girl who would only meet up at places that her parents AND grandmother had pre-approved; as you can imagine none of these places were very fun.
Your lady’s generation may well be the first to have that freedom of romantic choice, and that's something you need to keep in mind while making your decisions for your relationship – there simply isn't a ton of cultural precedent for her to fall back on.
China has less casual dating than America, and this has a lot to do with China’s conservative history.
During Imperial China, becoming a scholar was a huge priority because it meant wealth and status for families (which in turn meant better marriage matches).
Over time, the difficult scholar exams were transformed into Modern China’s college entrance exam 高考 (gāo kǎo.) Gao Kao is a standardized exam that determines what university you can enter (and whether you can even enter university).