Girls in 99% of cases do not write themselves, they are waiting for you to write to them first. They have it. I take it for granted. Where to go? You can't change them.
If they write to you first (not necessarily a girl) very rarely, then every time, before you write, you wonder, is it worth it? Is it interesting to a person? Does he (she) want to communicate? The best option is when there is initiative from both sides (agree, it's always nice to see that someone is interested in you)
It is strange to write to some person for a long time without receiving answers - the absence of an answer shows that the person does not want to communicate with you.
You can write one-sidedly, but no more than 2-3 times, otherwise it is an obsession .
People do not know how to read each other's thoughts, which is why they correspond or communicate verbally :-))))
Depends on the reasons for this behavior. But in general, it suggests that the girl has no interest in the conversation. If this is really so, I see no reason to impose it on another person. If this is due to some principles, then it is difficult for me to understand, the 21st century after all. But even here you can talk and come to some kind of compromise, probably. If the reason is valid, for example, strong employment, then no problem, I can write myself. But the interest in communication should be mutual.