What should a young man and woman do to please Allah? And is it permissible for a young man to marry the girl with whom he exchanged feelings before her engagement to another person, especially with his knowledge of "Let none of you propose marriage when his brother has already proposed"?

It is necessary to abandon interaction between non-mahram men and women under the guise of friendship or collegiality. The questioner must repent from the sins that occurred between him and the woman and sever ties with her. The woman must also repent and sever ties. If her fiancé is righteous, she should not let him go. However, if she is not pleased with his religiosity or character, she has the right to dissolve the engagement. After dissolving the engagement, there is no objection to proposing to her, with the caveat that the fiancé is a non-mahram to his fiancée.