Please tell me what is going on from the perspective of a bystander?

She is not worthy of you. Why should you abandon such a woman? Have you not done enough for her? You must have a bottom line as a person, and you cannot give in blindly. If you sleep with someone else like this, you will only be blamed for your inability to accompany her and give her a sense of security. If I really like you, I will work hard with you instead of complaining about this or blaming that. What she likes is nothing more than the feeling of someone liking her.