Going by the reviews I'd say that UnicornRidge's book is seriously one to avoid. It looks like one of those books that says that the right way to treat people is to manipulate them. No different to PUA books for men and perhaps written by one too.
Here's an anecdote that may be relevant to the OP if she's still around. Back when I was in my 20s I went out with a woman who was a socialist, a feminist and many other ists. She was pretty forceful, highly opinionated, and on occasion quite unpleasant to me. But what really drew me to her was that she knew exactly what she wanted, and she wanted me, which was good for my self-esteem. The relationship didn't work out and she was very upset when we broke up.
I then dated someone really nice. We went out for about a year. She was the loveliest, most giving person - but as time went on I felt the relationship simply wasn't developing because I had nothing to engage with. I didn't know what she wanted. She didn't have much self-confidence and nothing I could say or do could improve it, even though I knew hew at university where she was doing extremely well. I needed her not just to be nice, but to want things, not just deferring to me. On some occasions towards the end I was pretty unkind to her. Eventually I ended the relationship. I wanted to love her more, but I simply couldn't, and I realised I was never going to love her enough to take things further.
I thought of this because last night I was watching Ferris Beuller's Day Off of all things, and there's a scene towards the end of the film where he worries that his friend Cameron will "marry the first girl he lays" and "she'll treat him like shit because you can't respect someone who kisses your ass". I reckon there's some truth in that. If you think being nice means never asserting yourself in the relationship, it makes you harder to love - there's nothing for your partner to get hold of.
I'm a physically unattractive man and I've never had much interest at all from women. But despite that I've had some long term relationships and I got - and have stayed - married, despite everything. I reckon luck is a big part of that, but also I am genuinely nice, kind etc, but I worked out how to be present at the same time, and that's what counts.