It's been a while, but the book breaks down the mechanics of being a 'nice guy', in particular the 'transactional' nature of how they view relationships (especially with women), and then helps guys build behaviours that help them end that kind of thinking. If you find yourself thinking "I do all this for my crush/girlfriend/fiance/wife but they don't show interest/affection back", then it's perfect for you.
It's a really good book, but I would say it's only a beginning. I'd follow it up with Models by Mark Manson , and I have The Subtle Art of Not Giving a Fuck on my bookshelf, but haven't opened it yet.
The ones with boyfriends I met on dating apps while they were single. I'd tell them from the beginning that I was slow to commit and if they needed lots right away I wasn't gonna be the guy for them. When things went on for a while and they realized I was never going to be exclusive with them, they'd move on to an exclusive relationship and keep me as a friend. This method plants the seed for a whole bunch of girls coming back to you for hookups between relationships, or like I mentioned, when they're unhappy in their current relationship.
Regarding my divorce, I like control and I married someone else who likes control. We both wanted control more than we wanted to be with each other, so we separated and eventually divorced. We're still close friends, but we want different things and agree that it's best to be apart.
Edit: I read this book shortly after my separation and it completely changed my approach to relationships, both sexual and platonic. I can't recommend it enough if you want to fill your life with people that make you happy.
Gonna jump in here just because as an asian dude I know this is a touchy subject that non-asians might not understand. It sounds like you don't have an "asian" problem, just a social awareness problem.
A couple of books I think you can benefit from reading:
Mate by Tucker Max and Geoffery Miller
Models by Mark Manson
No More Mr. Nice Guy by Robert Glover
I also recommend listening to "The Mating Grounds Podcast" which was the precursor to the Mate book.
You have a lot of mindsets you have to unpack and work on. These books (and podcast), I guarantee you will transform your life, not just your dating life.
Best of luck
Something actually helpful might be this: https://smile.amazon.com/Models-Attract-Women-Through-Honest...
it's changing my life more than everything else in this community combined (that's just my oppinion) https://toptalkedbooks.com/amzn/1463750358 here is a link in case you haven't found it yet. seriously. read this book.... now...
check out Mark Manson's book Models too :)
Can't really do much via text - I found that this book really sets a good foundation, tho.