separated almost 5 months , how long do i wait?

Guest

My husband very coldly left our home one day in January and called me on his way to work to tell me to expect papers and that he wanted a divorce. No papers or any legal situations yet. He comes and goes as he pleases at our home. Has an apartment that he stays at , sleeps on the floor. Stays here sometimes. Says he doesnt know what he wants, says he loves me says he is unhappy. I dont know how much time to give him to make up his mind. I feel like filing but am not sure if thats the right thing to do . I am 41 , we have 4 kids .Things were up and down for yearls, mainly because of his temper and he drinks. Most everyone i know says to let him go, but its hard to do.