Putting on my amateur psychologist hat and I'm thinking you see some of yourself in him and like having him around and are hoping to "fix" him. It allows you to ignore your own faults and instead worry about his.

It sounds like he is a shitty worker and only cares about the opinion of people he needs something from. It seems money and job stability is low on his list, so he doesn't really bother putting any effort into those.

However with you, he wants/needs your love so goes to extreme lengths to show you how much he cares for and needs you. You love the attention and adoration and so it's like a drug addiction. Even though he's bad for you, and you know this, you stay with him because of the constant attention and praise you get from him.

What you need is someone who wants to feel good about themselves, instead of building you up constantly and then leaning on you for emotional support. It's a codependent relationship and it is bad for both of you.

You're giving yourself a purpose in life by fixing him up and he's giving himself a purpose by loving you unconditionally. He needs to get some help, education, work experience and do something with his life. Otherwise he'll end up in a soul destroying job he hates and blow what little money he earns on life expenses, never able to travel, own a home, living paycheque to paycheque.

If you had mentioned he had some musical or artistic talent and he was hoping to make that his career, then I might see some hope.

But what future is there for someone who can't even hold a job at a pizza joint? How hard is it to turn up, do your work and leave? He has to be doing something like sitting around talking, going out for a smoke, rocking up stoned/drunk/on drugs, or something else that makes it impossible to keep him on.

Do you want kids? Do you want a house? Do you want to travel? Does your future have anything apart from living paycheque to paycheque in it? If no, then he's right for you.

If you do want something else from life, you need to tell him that and give him the opportunity to get a job and keep it, get some education and/or qualifications, then if he can't do something that the majority of people on this earth do, you should leave him.