~ Adapted from email correspondence ~
It is good that instead of excusing yourself, you admit your sin and you are taking it seriously. Even if the sin persists, remember to never lose this – never begin to make excuses or to think that it is not a sin.
It is correct that true faith in Jesus Christ leads to holiness. However, a stubborn sin – or two or three – can tend to capture our attention to the exclusion of other aspects of our lives. When you take your entire life into account, is the basic disposition toward holiness? Is there an overall growth in knowledge, reverence, purity, and good works? If so, then this is consistent with a genuine faith in Christ. Instead of allowing a stubborn sin to become a stumbling block for your whole faith, you should consider the fact of your continuing growth in Christ to draw strength and encouragement in the ongoing battle against the remaining evil.
Accountability to other believers is not useless, but it is often overrated as an aid to sanctification. When it is effective at all, it is helpful mostly when it comes to outward conduct, and not as much when it comes to motives and thoughts. And it is effective only when the person does not hide or lie about his situation or progress. If you really want to sin, you will lie so you can do it and so other people will not find out. So even if you draw on the strength and pressure of a Christian community, see to it that your main focus remains on Jesus Christ. He is the sole Mediator, the Lord of the conscience, and the Shepherd of your soul.