I think my husband married me to get to the U.S. after he got his green card his actions towards me have changed. I have caught him on dating sites.

If your husband is a conditional resident, you can decide whether to assist him in removing the conditional basis of residence status by signing the I-751 form and cooperating throughout the adjudication process. If he is already a permanent resident (marriage was at least two years old prior to him coming to the US), you have less hold over his actions. At present, you have suspicions, but there is likely nothing that you can do with them vis-a-vis U.S.C.I.S. Even in the event that he eventually initiates divorce proceedings, you would probably not interest the agency into going after his green card since it appears that he has been living with you for the duration of time that he has been in the US. Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.