New information after Separation Papers signed

My soon to be ex and I signed separation papers almost 2 weeks ago. We have been physically separated since I moved out in June. I have since found out that his new girlfriend is one of his former high school students. After investigation, I have found that this student was not 18 until June of this year, and that he has been having at minimum a texting relationship since Sep 2008. Others have admitted that they helped him and the student set up meeting times as recent as May 2009. Do I have any legal options?

Your ex’s alleged affair does not affect the legitimacy of the agreement and is not a basis to change or rescind the same.