So why can't you sit down and have a sensible, grown-up conversation, respectfully, as equals? What happens when you try that?
In the meantime, what you should and need to do is to seek impartial, professional advice about your financial situation. Advice about what best to do now. Plus advice about what would happen if you were to divorce, or if he was to seek custody.
So, probably an independent financial advisor (pay per hour for advice. Do not get talked into buying financial products, on commssion, from them).
Definitely a family solicitor.
If all is well, this should reassure you. If there are practical changes you can usefully make, it should identify them. If the worst was to happen, you'd be forewarned and forearmed (as your DH already is, by dint of being a solicitor).
No drama, no angst. Just sensible, practical, impartial advice.