OP your thread gave lots of info that people thought needed more attention than your original question.
You have given hundreds of people the impression that you are being lied to and manipulated. People thought that this was worth pointing out. Many people have been in your situation and they have taken time and trouble to share their experience, knowledge and wisdom with you, hoping that it will help you.
Somehow you are ignoring all these responses because you don't like the sound of them.
In answer to your original questions;
Are you being unreasonable to expect your boyfriend to realise that his wife is a gold digger and a vindictive person?
Your information about his wife is being stage managed filtered by your boyfriend. Either he already knows that she is a gold digger and a vindictive person (presumably why they have separated) or he is wanting you to think that she these things. If he really doesn't know then tell him (but you have shown him this thread already)
Are you being unreasonable to expect your boyfriend to tell his wife about you?
No, YANBU, this is the least you should expect.
Are you being unreasonable to expect your boyfriend to stand up for himself and stop being a coward?
If he is being these things then YANBU but I can't see where he is.
Are you being unreasonable to expect your boyfriend to get divorce proceedings underway?
No YANBU this is the least you should expect.
There you go, I have answered your questions. But the main issue is that your BF is lying to you and you can't see it.