What Is The Treatment For Erectile Dysfunction?

My fiances penis only gets semi hard.. It was completely hard once out of all the times we made love.. And he does not have the normal sexual desire that a man usually has.. We dated once before about 10 years ago and had sex everyday and it was great, but he did have a problem with alcoholism back then.. Now he seems lees interested and says thats all I think about.. When we first got back together this time around we had sex more passionately, but now it seems like its not really there.. I dont know whats wrong, he says he is just older than he used to be..