Once you've had your fun with a beta girl and want to dump her, you can use many methods. One of them, which is simple, fun, and emotionally devastating, is called the "replacement method."

Step 1: When you talk to your beta, introduce a new female "friend" in your stories about your job or hobbies. This friend is very easygoing and shares your interests. At first, this slightly annoys your girlfriend, but she soon becomes quite curious and anxious.

Step 2: You gradually start talking more about this new friend, making your beta feel excluded. She starts to feel sad and inadequate as she notices the joy you share with your friend that you no longer share with her. If she becomes jealous, you just gaslight her and blame her for trying to isolate you from your social circle. She will feel guilty, egotistical, and stupid.

Step 3: Arrange for them to meet. It should be situational and not look premeditated. Perhaps the "replacement" is your colleague, and they meet at a work party. Or maybe it seems like a chance encounter at a party with friends. What's important is that you and your new girl show genuine emotional connection. You should laugh and enjoy each other's company. Your beta's uneasiness will grow. She will feel inadequate and useless.

Step 4: You start pulling away from your beta. She clings more to you. When she becomes annoying, you should compare her unfavorably to her "replacement." "Why can’t you be more relaxed like Lydia?" This cuts deep.

Step 5: As your beta becomes more insecure, start to openly consult the "replacement" on personal decisions over your partner. Make it clear that the new girl's opinions now hold more weight than your beta's.

Step 6: This is critical. You need to provoke your beta's nervous breakdown over your relationship with the "replacement." Start being openly flirtatious with the "replacement." Maintain plausible deniability. Hug her, kiss her on the cheek. Openly prefer to hang out with the "replacement" rather than with the beta. Become bolder and more shameless with this. You need to trigger a confrontation with your beta, but she, not you, should start it. When she finally confronts you, use this as the catalyst for the breakup, blaming your beta's lack of trust or excessive jealousy as the reason why you can't be together anymore. This will ensure that she will eventually only blame herself for the breakup.

Step 7: After the breakup, quickly make your relationship with the third party official. The quick transition will make your beta feel replaced, ugly, unloved, and unworthy of attention.

This simple strategy leaves deep psychological wounds: trust issues, low self-esteem, anxiety, identity crisis. Drawing it out for 3-4 months seems optimal for the strongest impact.

Importantly, this will leave your beta sexually available to you if you show any interest again.