Hi Mangmo.
Lots of people on this board are trying to improve things with their pwBPD and many also have children so you are in good company. No one on this board is going to advise you to leave your marriage. We work together to help you find your own way and navigate to a better place. There is hope. It is best if both people are working to better things, but one person making changes can improve things considerably.
We have several articles, some of which involve tools and strategies to improve communication, de-escalate situations and improve your own coping skills. Check out this thread which has links here:
How to get the most out of this siteDon't be invalidating and Don't JADE sound like they might be a good place to start reading for you (they are in the thread I linked you to above)
Read the articles and see what you think. We can talk about them.