Women are going to vacillate between the alpha's and the beta's (as Rollo Tomassi terms 'alpha fvcks beta bucks') to satisfy either side of her sexual strategy -- the desire to fornicate for superior genetics (alpha fvcks), and the desire for a mate who will nest and provide resources for the offspring long-term (beta bucks).
Using rigid with-or-without-you alpha game will attract her to you sexually, but it won't *keep* her attracted to you emotionally. Remember that women act based on how they *feel emotionally* and she will lose attraction for a man if she feels emotionally invalidated and disconnected by his IDGAF alpha player attitude. There has to be reciprocation of affection, warmth, and emotional openness or she will check out and move on to someone she can feel safe and fulfilled with.
Your best chances of keeping a woman is to exhibit traits of both alpha and beta, thus satisfying the totality of her reproductive strategy. Being too hardcore alpha -- too aloof and indifferent (a 'cold fish'), too dictatorial in your leadership frame, and making her feel like an expendable mistress -- will alienate her emotionally, cause her to resent you, and bring the relationship to its demise by driving her away. Women do not remain in relationships with players, at some point you will need to be her partner. However, of course, being too much of a sensitive, submissive beta nurturer and provider, and thus living within the frame of her security needs, will kill her sexual desire for you in short order.
Relationship game is about finding a sweet-spot balance of maintaining the dominant frame in the relationship, with aspects of sweet sensitive beta calibrated to your woman's individual emotional needs which adds value to her life. Finding that balance can be more difficult than pickup.
I would look into Corey Wayne, I believe he offers a more balanced, less red pill misogyny view on dating women where he emphasizes being a good boyfriend, lover, and partner, not just a pickup artist.