Please ignore eggncress advice about Debt becoming joint upon separation. I worked in Debt Recovery for a major Bank for 25 years, and this is simply not true.
When Banks/Creditors pursue repayment of debt, they can only go after the debtor themselves, or a Guarantor (if there is one) or a Third Party Surety. You would know if you had guaranteed his debt, as you'd have had to sign papers. If he took out Secured Loans against your home, that could be a problem, but that's wholly unlikely for the purchase of a motorbike. If the debt is an Unsecured Loan in his name (my best bet), no Bank or Creditor in this land can come after you for that.
Now, you might find that upon separation, that his Solicitor wants you to hammer out an agreement, whereby you agree to take less assets than him, to take account of the fact that he is left with the debt in his sole name, and sure, you might agree to that, if say the loan had been for something you both benefitted from, like a huge holiday or the purchase of 2 cars, and you were keeping one each, but, if the loans were for his bikes/toys, and he will keep them, then he gets to keep the debt too!
Sit down with a piece of paper, and work out how the finances would look if you were to separate. What is in his Pension pot? You are entitled to half of this sum, which is often taken in cash instead. You are entitled to half of all assets accrued during the period of the marriage. You are also entitled to be recompensed financially, for being the parent whose career took the back step. A good lawyer will be worth his/her weight in gold here.
Work out what Child Maintenance he'd be liable to pay you. Child benefit is payable to you. Your council tax would go down by 25%. You may be entitled to Tax Credits. Photocopy his P60, so he can't lie to CMS (many men do).
You may feel more empowered, when you realise that you can financially afford to cut this dickhead loose.
I'm amazed that you are allowing this behaviour to go unchallenged. What do you do with his plate, when it's left on the table? I'd throw it in his lap.
Please stop being a doormat. Your kids are learning here, than Man is King and Women are merely there to serve. It could mean that your son(s) grow up to be chauvinistic pigs, or your daughter(s) grow up thinking that being treated like shit, is the best they can hope for.
You can't do another 6 years of this bullshit. And stop getting up at 6am to make his fucking coffee. In the nicest pay possible, what the fuck are you thinking, pandering to this knobend?
My guess is that there's another woman. Have you checked all phones/e-mails etc?