How do I go about deporting him if I've come to realize he only married me for papers?

If you entered the marriage in good faith, but he left you, then this can be a challenge for you. It would have been wise to take advantage of the 90 day period to get to know your fiance a bit better. You did not have to marry him. Now, that you have married him, he may try to file for adjustment of status. However, it is unclear if your unwillingness to file the form I-864 will stop him. You can file for divorce, where you believe that there are irreconcilable differences. He is not a lawful permanent resident until the USCIS has approved the adjustment of status. That is an additional step, which he has yet to undertake. It is unclear if he will ever take further action. Many make mistakes at this stage, so it is possible that he will create complications, even if you do nothing. In general, he will not be a high priority at USCIS, if he has not committed a criminal offense, but you can complain, if you wish. If you properly complain, then if he tries to forge your signature on a form I-864, then the USCIS will be on notice. That means it will be in a better position to accuse him of fraud if he gets desperate by not properly processing his paperwork. However, you cannot revoke a K-1 fiance visa once the fiance is admitted into the U. S. Good luck.