I didn't look for and read the manual because I saw a YouTube tutorial and I knew you should press the release button.. but I forgot because I have only done this twice before. Simple as that. My question was if the breaking of the film from the cartridge was as a result of this or could it be another mechanical fault. It seems from one reply here it can be because of not pressing the release button.
Breaking the film is the least bad of the two things that can happen. The other possibility is breaking the camera.
If you don't press the release button, the takeup spindle in the camera will not let the film be rewound. Pressing the button disengages the gearing and allows the spindle to spin. There is a close to 100% probability that failure to press the button caused your problem.
Those of us who grew up shooting manual rewind cameras do this instinctively. To those who learned on auto-rewind 35mm or non-35mm cameras it is not immediately intuitive.
Developing B&W at home is easy. All the nice tools are useful and encouraged, but you can get by with a black bag, developing tank, kitchen measuring cup, kitchen thermometer, scissors, a bottle opener and a medicine syringe, as well as a few 1 liter water or soda bottles to store your chemicals, You will also need a small bottle of Adonal (Rodinal) or other developer, a bottle of stop (or diluted vinegar), and a bottle of rapid-fix. Film can be dried by hanging with heavy paper clips. There are numerous YouTube videos demonstrating the technics. Of course, since you don't want to just look at negatives, you will need to find a way to print or scan the negatives.