Like many of the posters have already said, it really depends. I second the posts about the type of characters, but I will also add that the cultural context matters. If the cultural norm in your setting is similar to that of modern Western, English-speaking countries, the expectation will likely be to date for something similar, like dating for x number of months before going steady, then a y number of months before marriage. However, other cultures expect either longer or shorter periods of courtship where acceptable expressions of affections may vary in intensity. Whether a love confession is considered inappropriate or not is largely informed by what is considered "normal" in that culture. Will every single person agree? No. But it's likely that most people's outlooks will have been informed by their environment in some way, so this is where the personal traits of the character in conjunction with whether they fit into the norms of their culture come into play.
Also keep in mind that our modern norms have a lot to do with our level of technology. Quick example: chaperoning was a real cultural phenomenon before the invention of our modern and varied forms of birth control, for obvious reasons. Even if you have birth control, the frequency of plagues and other diseases will also contribute to the modulation of courtship behaviour. So my recommendation is to take not only the characters' temperaments into account, but also the overall cultural and societal environment at play.
There are other factors, but this post is long enough. Tl;dr: look at the context and write the sort of behaviour that fits.
