Can I file a lawsuit against a person I know for humiliating me on his Facebook and fake Facebook with my name for 3 years?

This started happening 3 years ago. Although I am no longer in touch with him, he is like a stalker in my life now. I am an international student who came to study in USA 4 years ago. The person who is doing this is my mom's friend's son. When I first came to US, I was all alone and needed a help. My mom asked her friend to help me out until I get on my knees. My family is poor and I usually support myself. First he seemed nice and helped me a lot but I paid him back some money I borrowed and etc., then I thought there's no other attachments or obligations between us. His help wasn't really that substantial; just helping me meet with new people, finding an apartment to rent, finding a job, lending me some hundreds of dollars and etc. like you know some basic things for someone who is naive and new in USA. Plus his mother owed my mom some money in the past, so I thought he was helping me out because of that, and I didn't know about him at all in the past. Just life's circumstances brought us together. My mom did clarify to me that she has sent me there because his mother owed money to my mom. Then he started his mind games as if he has some kind of poker face. It's a very long story. I can't write every single details here. Now he's humiliating me among friends, people I met through him, making up stories about helping me out, supporting me financially or in short like he's playing a victim game. It's like he seem to think he owns my life, dependent person of me, I owe him a lot in life or I am not sure, really confused and never understood him completely. I do think he has some kind of mental illness like world or other people's life only turns around him like narcissistic personality disorder or something else. By the way, for about his personal life, he is gay in the closet although he has a wife, a child and hooks up with whores, drinks a lot an etc. That's probably the reason he's doing all this sh*t.