I've brought my wife to the US on a fiancé visa and we've been married for a year. It became painfully clear that she only married me to come to the US and she is not in love with me like I was with her. Few months ago she received her conditional green card. I want to divorce her but I found out that it is very expansive and time consuming. I thought about just not filing form I-751 with her when the 2-year anniversary approaches since, as I understand it, she would be required to leave the US. Or may be filing for divorce right before 2-nd year anniversary? Has anyone been in this situation before? What would you recommend as the best course of action?

That is so sad. NOw is the best time while it is conditional because after 2 years there is another interview for her if your marriage is working. They will ask for proof that you will live together for 2 years, as you can see it is a conditional, it is not permanent yet.