It doesn't help to watch videos, if you can't grasp the content. Every LoA teacher tells you to live your desire now. Does the affirmation "he will be back" fit in with that?
When you have watched hundreds of videos and still don't get it, maybe you are just not ready yet. No offense, it's my own experience. I stumbled over LoA in 2011, but I wasn't ready. I wanted an ex back desperately, but I couldn't win this fight. Even if he had come back, I hadn't been able to keep him.

I don't like telling people that they should give up, because I know that it just makes them feel bad and they won't listen anyway. But you are far from a success from what you write. I wouldn't contact him. Not because there is a rule that says that, but because people react to your vibration and if you would contact him now, it would be a setback and I can guarantee you that! I think the best thing you could do now is to focus on yourself and forget about him for a while. Study LoA without doing it to get him back. This whole ex back stuff makes you blind to how reality really works. You can't feel as an unhappy victim and really understand your power, it's two completely different vibrations.

It's up to you whether or not you message him but I strongly recommend that you don't after reading your posts.

You're still of convinced and appear to be living in the current moment.
You're coming from a place of lack and desperation.