I had this happen to me and my good friend.

They kept it a secret for a year and I only found out from another buddy of mine. I promptly dumped her and stopped talking to the friend. He later bragged about it my friends and then for some reason threatened to hurt me. I took the messages the police and inadvertently got him deported. I didn’t know at the time but he was an illegal alien who overstayed his student visa. Oops.

He later apologized to me after for the hurt he caused. I also told him I felt hella bad for accidentally deporting him.