But as far as getting one hundred percent from a woman who is in love with someone else of eight years, not gonna happen.
This is going to sound really fvcking evil, but the trick to getting her away from that other guy is to attract her to a point where she falls in love
with you.
All women who are in relationships have something in common: There's something that they're not getting from their man. What you need to do is figure out what that something is, and give it to her.
...and if you're wondering, it's not candy, flowers, jewelry, etc. It's also not love, nor romance.
I'd say about 80% of the time, they're not getting any excitement nor fun out of the relationship. If you have no clue what she's missing from her relationship, the odds are pretty good if you show her that you're interesting, fun, and exciting to be with.
The other small percentile could be other things. It could be sex, money, or even something silly like positive reinforcement (especially if her s/o does the exact opposite by telling her she's unattractive or worthless.) It could also be a combination of things.
Once you genuinely figure out how to fill the void in her relationship, stealing a woman from her man becomes incredibly easy. Everything that makes you incompatible with her becomes irrelevant. You could be married yourself with four kids, and she'll still want you because you can give her what her s/o can't.
What a woman wants and needs right at that moment is what's most important to her. That's why women generally suck at doing any long term planning.