Not attracted to my boyfriend any more

Please don't judge me on this I already feel awful
I've been with my boyfriend for 20 months. And im coming to the point I'm not attracted to him any more. I don't want to kiss him let alone have sex with him.
His put on a lot of weight since we met, from drinking every night (a bottle of red + beers) and eating fast food every day. His pants don't do up so he has been wearing baggy shirts to cover his belt that is holding them up. His manboobs are almost as big as mine. I'm only a B though.
His a mechanic and he will come home smelling of car oil, stained hands and hair smelling of fuel. This was so sexy when I first meet him but now he won't even shower when he goes to bed. His a smoker too so he smells of that too. I couldn't go to bed like this I would feel so gross. When I get into bed I feel like I'm lying down in a car repair place next to a drunken smelling alcoholic. And then he complains if I don't want to have sex with him. I feel like his mate more than his girlfriend. He will roll over the second I'm in bed and fart on me and they stink!! And then laugh. I wake up to this too. He says to me if you love someone you will "make love to them no matter what they look like or smell like etc". I've always been one to have a shower every night brush my teeth twice a day. He does it now once a week if I'm Lucky! It's descusting.
He never does his house work always waits to I come around on the weekend to do his week worth of dishes wash his sheets etc.
His got two sons and has never taught them to lift the seat so there is always pee all over the seat and they don't flush or wash their hands. I'm 100% over it. I don't know what to do. I've tried to talk to him last night the toilet was so bad I went and weed in the garden. He got so made at me told me I don't have two sons so I don't know what it's like. That their mother should be teaching them.
I want to start toilet training my daughter but I can't have her sitting on that toilet.
His now started to not wash the sheets at all and I refuse to. I don't think his kids sheets have been washed this year maybe once or twice. He has just a top sheet on his bed now no protector same as his kids. And it's been on there all month.
What can I do. I can't keep up with my house work let alone his. I could never live with him that's for sure I just feel sorry for his sons.
When I wake in the morning after being farted on. Bum pushed against some part of me and just going for it. He will say good morning grumps. He never says to me good morning beautiful. Or something sweet like that. So of course I'm a little but grumpy but I think it's more up set that grumpy.
Then he will go and have a shower. I never enjoy the clean man im with any more. Cause straight after his shower his off to get dirty again.
He shuts me down in anything I comment on. This morning I looked out side and commented on how cold it was he goes no no it's not. Or I I'll say something like this show looks good and he will say no it doesn't.
I feel like his heart isn't in it any more. He doesn't have conversations with me any more. Some days I just talk and talk and talk. Last week he sat there and then he said you would talk under wanted if you could. So I just stopped talking.
If I dress up and get out of my mum clothes he never says how nice I look. He will say geeze your dressed up today. Or last night when he got home he ran straight up to me put his hand up my leg and pants and said oh what are you wearing! You need to take these off they are making me horney. Then realized I was wearing a short shirt and wouldn't stop rubbing my stomach Ina gross way. I really lost it last night. Said all I want is to be called pretty not feel like a peice of meat. And he took is so harshly and didn't touch me the rest of the night or really talk to me.
His so lazy in just everything in life. His meant to get a parenting plan in place by next month and he hasn't even rang his lawyer. His meant to get his house evaluated but he hasn't. His meant to of gotten his son a dog for his birthday which is today but he hasn't and he promised him this year. His saying to everything is what's the point. I told him his 3 and a half year old needs a new bed cause his too big for his toddler bed. Again what's the point. I've had it. What's the point of us I'm starting to think. But if I said that to him he would get pissed and loose it at me and just say something like just go.
His house is at the point it's far to unhygienic and filthy I don't want to come here any more.
I'm at the point of life I want to settle down now get married and have another child. We have discussed this. But I can't have another child to he stops smoking again he says what's the point of stopping. His youngest keeps getting croup and has bad lungs the specialist has lead this to him smoking but he doesn't believe this. I can't have a child and have him around that even when I pregnant. So it goes to show doesn't it how into all this he is.
How do I regain the spark. I'm starting to feel like it's to far gone now.
How do I approach this. How do I talk to him???