I can offer some considerations for you to think about in this situation.
Disclosing information about infidelity is a complex and sensitive matter that can have significant consequences for everyone involved. Here are some points to consider:
Ethics and Honesty: It's essential to consider the ethical implications of your actions. If you know that someone is being deceived in a committed relationship, you might feel compelled to be honest and transparent about the situation.
Potential Consequences: Revealing the truth might lead to significant emotional upheaval for all parties involved. It can result in the end of their relationship and cause pain and distress for the boyfriend.
Consider Your Motives: Reflect on your motives for wanting to disclose the information. Is it out of guilt, a desire for honesty, or to break them up so you can have her for yourself? Understanding your true intentions can help you make a more thoughtful decision.
Talk to Her First: Before involving her boyfriend, consider talking to her directly about the situation. Honest communication might lead to a resolution or an understanding of the path forward.
Potential Backlash: Keep in mind that revealing the truth might lead to negative consequences for you as well. It might strain your relationship with her or cause complications in your personal life.
Privacy and Boundaries: Be mindful of the privacy and boundaries of others. It's essential to respect their autonomy and allow them to handle their relationship issues in their way.
Impact on Your Well-Being: Consider how keeping this secret or disclosing it might affect your emotional well-being. It's essential to prioritize your mental health and happiness too.
If you find yourself in a situation where you are unsure how to proceed, seeking guidance from a therapist, counselor, or a trusted friend can be beneficial. They can offer an outside perspective and help you navigate through the complexity of the situation.
Ultimately, the decision of whether or not to inform her boyfriend should be made carefully, considering the well-being of everyone involved and the potential consequences of your actions.