Yeah, I will also contribute to this one.
There are people who you never can trust (hedonists, e.g. sex or drug addicts, “you have to have tried everything once in your life!”, people needing constant validation from others), people who you can only partially trust, and people who you can trust the most (e.g., those with strong moral values, good upbringing). The people you can only partially trust will not display bad behaviors towards you (e.g., steal from you, cheat on you) AS LONG AS THEY VALUE YOU because they fear the consequences (e.g., losing you). Once they do not value you anymore for whatever subjective reason, they become a liability because the consequences do not matter anymore to them. It is frightening to think that the people you can only partially trust may constitute the majority, how many more people will steal without punishment by law do you think?, more than now?, possibly.
Further, people are need satisfiers. Positive self-esteem, belongingness (e.g., approval from others) are needs. It is debatable whether sex is a need, but we all know that it is something that many people (not monks, but then again we do know about sex scandals in the church community) pursue and want and "need".
Also, as I understood from the book, nice guys should become more clear about what they want. On the other hand, I think that “jerks” are not attractive because they are not nice, but that they DO convey clearly what it is that they want and have to offer. They for instance would, after having aroused the other person, clearly invite – verbally and/or non-verbally – their target for sex. And they get stalked sometimes, because after having “hooked” the other person, they suddenly retract the thing that they supply and that the other person wants to satisfy his or her needs.
Thus, should your SO be a person who you can only partially trust AND not value you anymore and/or have a high need to get his or her needs satisfied, or a single person be in search for whatever need satisfaction, and (s)he meets a “jerk” who clearly conveys “Hey, wanna get some?”, then there is a high chance that "it" happens.
In conclusion, it is an illusion that jerks have more fun, also jerks end up alone. But they are clear about what they want/have to offer. Thus, just become more clear about your needs/what you have to offer of value and your boundaries, and try to find someone who you can fully trust (i.e., picker issue).
The ones that you had were likely bad apples from the majority. It is not you, it was them. But do know, there are never any guarantees.
I wish you well brother, strength!