Question

I have been seperated from my husband for almost three yrs now.He cheated on me for the last year of our marraige. I found out and he baught a bus ticket and asked me to leave. Well I left.He said he would file for divorce and hasen’t done so.My question is,How do i file for divorce on my own if i dont know where he lives and i am on limited funds? Where can i get the paper work to file it on my own? can i file it on my own?