Are the feelings towards this young man forbidden, and must they be ended, or are they not forbidden and can they remain without communication until formal engagement?

The blessing of guidance and commitment to religion is the greatest of divine blessings, due to its positive impact in this world and the hereafter. This girl is an excellent role model in her interactions with young men, as she acted rationally and preserved her dignity, which increases a serious young man's desire to marry her due to her chastity and honor. As for the natural feelings exchanged between a young man and a young woman, there is no sin in them as long as they are not translated into actions or words, for the Prophet, peace and blessings be upon him, said: "Indeed, Allah has pardoned for my Ummah what they whisper to themselves, as long as they do not speak of it or act upon it." If the young man is serious about marriage, he must propose to the girl through her guardian; otherwise, the girl should forget about him.