Hello LadyJayne, i am new here to and it relly is a great support.
After reading your posts i cant believe what your partner is being like. Surely if you love someone and you intend to be together for the rest of your lives, the important thing is to help each other and do whatever you can to sort out the problems. After all, as a couple your problems are just as much his.
Over the past few years we have been to hell and back, and on many occasions my fiance told me to leave her and start a new life without her - much of our debt is down to family problems (her side). But as i love her i want to stand by her and work through everything together. After all, the problems wont last forever and then you can concentrate on the better things in life.
In my opinion, if your partner loved you he would do everything in his power to help you put things right - i mean, does he have no debt at all? he should help and work with you to adjust your lifestyle so that you can reduce your debt instead of making you feel terrible.
If you both feel however that things arent working and that it would be the same even without the presure of debt then you should talk together about this and see if a break or split is the best option
BTW - surely if you have been contributing to the household bills and mortgage - it sounds like this as you mention joint accounts etc - and can prove you have contributed financially, i would have thought that if you had been together over a certain amount of time (6 momnths or 12 months i believe) you have an entitlement on any assets in a break up - especially on the increase in equity on the house - it might be worth reminding him of this next time he is keen to threaten you!
If you don't make mistakes, you're not working on hard enough problems. And that's a big mistake
After climbing a great hill, one only finds that there are many more hills to climb.