So i accepted it, the issue is that now i have to tell it to my boss that seen me growing up, helped me a lot in my personal life and he was like almost a "father" for me with obv all the cons about the "life" in the company.
Reading the OP, You also said...
so we started to discuss about it as X was too low for the job i was actually doing, we ended up with something that would be "okay" for me and he even told me that i would become the manager of the software office and he was going to say it to the current manager and other developers, but in 1 month he still didn't said nothing to other about it, (we're in 5), i've accepted it.
It doesn't sound like he's this "fatherly" figure that you're talking about when he said he would raise your pay to X then never actually doing it. It's sadly a fairly standard tactic that you fell for. You caught your boss offguard by turning in your first two weeks and the reason why he promised you X pay is because he wants you to stick around. He won't actually do it and pretend like he's trying to put in the paperwork and talking to people but reality is he's just stalling you for time because he's trying to prepare your leaving. Now when you put in your actual two weeks notice, don't be surprised if he says, "See ya later. You can leave sooner if you want."
Actually it is standard practice these days to trip millennials to believing that they're working for a higher purpose and guilt trip them into never leaving or looking for a job. Reality is your boss, the "fatherly" figure who watched you grow up is also running a business where real money is being made or lost. I suspect if he had to ultimately choose between you or the needs of his company, he would choose the company.
Best advice in the future is that if you want a pay raise, ask for it first. Ask what you need to do, what the steps are and see what your boss says. If your boss says no, then find a new job with that pay and simply turn in your 2 weeks. If he suddenly says he got the money, don't fall for it because if he wasn't willing to give it to you 2 weeks ago, why is he suddenly able to now? Such a person can't be trusted and transferring job is the smartest move.
With that said, if you got your job offer, turn in your 2 weeks. And no matter how much he tries to guilt you or make you stay around, don't fall for it. A lot of people are worried about changing jobs or that they will fail at their new jobs so they stick with where they are because after all it's a job. These people end up miserable and unhappy and feel unfulfilled in what they do. Unless you have a family and they need your support, sticking with a bad job is not a good idea. Sure you might fail at your new job and it might be worse, but you already know how bad it is at your current job and shouldn't stick with it because of nostalgic reasons or because your boss promised you something that he never delivers.