Exactly
From my own experience with my gf, once she saw how i had a constant supply of women in my life, be it interests or even just friends she began to see me as a worthwhile guy to know.
She still has dreams about me cheating on her or leaving her, she seriously worries when ever i'm at parties or away that i may cheat, not because im untrustworthy, but like the gym class heroes song cookie jar goes 'I like girls, they like me'
She acknowledges me as a quality male, so she respects me, she treats me very well because she wants to keep me around.
Some people go to the gym just in the hope of getting more girls, sure, this works for a while but once she sees your just a built body with no personality your time is up, learning pick up is like this, you can use all the canned sh!t you can find but what happens when she wants to set up a third date? You revert to your old ways, she ****s off.
This will never keep a woman, you need personality traits or hobbies to go along side game if your planning on an LTR
To keep a high quality female, you must be a high quality male.