Do the dead hear the living and see their deeds, and will they recognize each other on the Day of Resurrection? And what is the ruling on showing kindness to girls without engaging in intercourse?

The issue of the dead hearing the speech of the living has been previously answered. As for their seeing the deeds of the living in their graves, there is no sound evidence for it. Regarding the mutual recognition of the dead on the Day of Resurrection, the legal texts indicate that people will recognize each other on that Day. The great ones will disavow their followers, people will recognize the prophets, and Prophet Muhammad, peace be upon him, will intercede with the greatest intercession. The people of Hell will recognize each other and blame each other, while the people of Paradise will visit each other and enjoy themselves in the market of Paradise. As for flirting with girls, it is one of the most dangerous and sinful abominations.