Relationship issues..

I’ve been with my guy for 2 years. Things were great at first, but the past couple months, my feelings are changing.. I work full time and take night classes for college, meanwhile, he hasn’t had a job in a year and a half. He doesn’t even attempt to get a job. He stays up literally all night long and plays video games only to sleep all day long. By the time I get home from work, he’s already up playing video games. He won’t get a job, he’s very lazy and very irresponsible. He knows how I feel about this whole situation, but he still does it.. I want to leave him.. I don’t feel happy anymore.. I want to tell him tonight, and I’ve been so confident the past few days about it because he hasn’t been home, but now I’m scared. It’s like my stomach dropped and I’ve been so nervous.. I don’t know what to say to him now. I can hardly say a word to him right now.