How do I maintain my fast in the face of these sins?

Fasting is not merely abstaining from food and drink; rather, it is the fasting of the limbs and the heart from sins. Ramadan is the month of piety, and true fasting is abstaining from false speech and acting upon it. Backbiting and sins diminish the reward of fasting, even if they do not invalidate it.

To preserve the completeness of fasting, one must achieve patience in refraining from sin. This patience arises from:

The servant's knowledge of the ugliness of sin and that Allah has forbidden it as a protection for us. Shyness before Allah and His constant watchfulness. Considering Allah's blessings, for sins remove blessings. Fear of Allah and dread of His punishment. Love of Allah, for a lover obeys his beloved. The nobility of the soul and its aversion to lowliness. The strength of knowledge regarding the bad consequences of sin. Shortening one's hopes and the servant's awareness of his swift demise. Avoiding excessive curiosity in food, drink, and other matters. The steadfastness of the tree of faith in the heart, for the stronger the faith, the stronger the patience in refraining from sin.