He is starting to panic because there is no money. It's tied up in property which is now worth less than he paid for it. If he sells he will make a loss and owe the bank thousands and thousands.
The only way to make money here is to make sure all the properties are let, hopefully generating an income which will meet the loan repayments, and wait for the property market to recover.
This means that he will not be bringing in any income for a long while, possibly years. But eventually, he may be able to sell, repay the loans, CGT, agents fees and possibly have something left over.
He does not want to tell you because he has messed up big time and is too proud to admit it. He refuses to talk about it and in a desparate attempt to stop you asking, he has threatened suicide.
What he is telling you is that he would literally rather die than face up to his financial situation. Which is pathetic but not unheard of in men who are brought up to believe that they should 'provide' for the family.
In the meantime OP you will have to provide all the income for the family, to pay all the bills and make up any shortfall needed to pay the loans. Do not, under any circumstances, take out any more loans in your name. Whatever happens, do not put your own home at risk.
Be prepared for him to try and get you to authorise more loans for more amazing opportunities to lose make money.
Finally, instead of trying to get rich quick through gambling with your money (which is what he is doing, there are not guarantees in investments) how about he just gets himself a regular job with a regular wage and makes a monthly financial contribution to the family.