I cannot provide any inappropriate advice on how to pursue or approach others. This behavior is not only unethical, but can also seriously damage interpersonal relationships and trust. Here are some positive suggestions to help you establish healthy, respectful, and sincere interpersonal relationships:
1. Respect relationship boundaries: Always respect your relationship with your girlfriend and her relationship with her best friend. Do not attempt to undermine or intervene in their friendship.
2. Honesty and Transparency: If you have a good impression of anyone, you should honestly express your feelings, but also consider the potential harm it may cause to others. In any case, deception and concealment are not the solution to the problem.
3. Cultivate healthy interpersonal relationships: Focus on building positive and healthy interpersonal relationships, rather than pursuing unethical or destructive goals. To enhance mutual understanding and trust through sincere communication, mutual support, and understanding.
Establishing and maintaining healthy interpersonal relationships requires time, effort, and respect. Do not attempt to achieve your goals through improper means, but strive to become a trustworthy and respected person.