Finally, consider another definition of contentment by A.W. Pink. It should speak well to any trial you might be going through in life, singleness or otherwise:
"Contentment, then, is the product of a heart resting in God. It is the soul’s enjoyment of that peace that passes all understanding. It is the outcome of my will being brought into subjection to the Divine will. It is the blessed assurance that God does all things well, and is, even now, making all things work together for my ultimate good.”