How can a man marry another when his heart is attached to a woman he was not destined to marry, along with his fear of being unjust to the new wife?

We advise you to get married as long as you are able to, and it is not permissible to abstain from it under the pretext of your heart being attached to another. So, abandon these illusions and seek a righteous woman who will assist you in matters of your religion and worldly life. Strive to turn your heart away from attachment to that girl; this is easy with the help of Allah and by striving against your own self.