Fiancés laziness bugs me

Samantha • Ohana means family and family means no one gets left behind or forgotten.
Hello today. I'm starting to realise my fiancé is going back to his old self and he doesn't seem to think he is. He used to be really lazy and he's going back to been lazy again and doesn't get up till 12-1 in the day because he is up late till 3-4 in the morning on his PlayStation and I really hate him when he's lazy cause I can't cope with lazy boys! I went to sleep at 2 in the morning and managed to get up at 9 this morning feeling awake :) he is losing muscle on his body, I don't want to say he's putting weight on because this sounds like he is getting fat but he is getting literally the slightest bit of tummy quite slightly too and I've told him he's losing muscle and he spends his wage on food all the time. He complains about his mum constantly but if I try to help him he says I don't understand cause I don't know her like he does as I've said he needs to confront her but he said she won't listen at all. All I hear is his mum has wound him up and I'm getting sick of it to the point it's boring me! We want to move out in about 2-3 years so we've been talking about it and saying we need to save money and I've said get a savings account and he's like I dunno and I said what cause you can't be arsed and that's what it is, he just said he will save using the tins you can't get into, my mum doesn't think I'll move out with him because he won't cope with it or save his money.  I hate nagging so I don't want to seem like I am to him so I don't know how to confront him about it?