I've never been lucky enough to be a SAHM. I would've loved it, but life didn't work out that way for DH and I. And I don't mean 'lucky' as in 'has it easy', I mean 'lucky' in being able to have the role in life you've wanted.
But my sister has always been a SAHM, never held a 'paying' job in her life. From day one, her DH has treated her with respect and appreciation for the hard work she has done in raising their children, keeping their home, and enabling him to do the hard work and long hours he did to keep them in cushy comfort. He consulted her in his work vs family life decisions and never (well almost never) questioned her expenditures. He would tell all and sundry "I could never have done it without her" as she would say "I'm so lucky that XX's hard work means I can be home". She has never had cause to feel he resented her 'easy life' as a SAHM, nor did she ever take him to task for his long hours and sometimes absence from family events. To me, that's an equal partnership.
OP, it seems to me that you are very vulnerable. You cannot make your partner respect your contribution to your family. Even a 'legal wife' cannot do that, but at least she has clearly defined rights within the law. You need to take legal advice as to your position. Not with an eye to divorce, just so you know where you stand. Knowledge is power.
I've always earned the same or a bit more than my DH, so I was able to approach any marital problems from a position of power, knowing I had the means to walk out the door with our children and start a new life without struggling. I'm the first to admit, it's a great feeling to know that I didn't have to put up with shit for fear of not having means to leave or money for a place to live.