I want to change

I used to watch porn and fap kinda everyday about 6 months ago i discovered nofap. I quit watching porn, hit the gym and went to different places but i am having trouble with the mentality of fap again.I am confused sometimes internet says its Okay to fap peacefully and i fap then i regret it.I completely quit porn but I come across erotic scene randomly in movies/social network once in a while and get aroused.I try to control my desire/urges in me some hours then i lose my patience my fap.I start my nofap for a day or two see benefits then again reset again,Most of times these were during night time when i had difficulty sleeping but now its increasing .I wanna know what kind of mentality and stuffs that i should have regarding this for a long term nofap and recommendations of a book or two would also help.

 

Thank you ill try my best in doing so