I don't consider what this is to be a partnership. He has not met my needs since being married, including financial, as he has always insisted I "contribute" as if raising the kids nd managing everything in the home isn't contributing. He works from 6am til probably 11pm, on average - 2 jobs, 1 to help pay the bills and the other is the business he started without consulting me and which he intends to eventually be the only source of income. He doesn't ever take any days off to spend with us.
When we got married I made it clear I wanted four kids. He agreed, and he promised to raise my oldest as his own. I have the means to raise four kids without him and always have. I currently work three afternoons a week and pay a babysitter to be with the kids while I am gone. I have continued to work because at the beginning he required me to and as time went on, because I figured I would need a way to support my kids someday.
He has kids from previous relationships, one of which used to come every other weekend (my husband was rarely home for these visits). He threatened to his psychiatrist that he wanted to murder my children and actually had a plan on how he would do it. With my husband never around, I put an end to those visits, but have encouraged him to continue working on his relationship with his son (which he won't do because he is working).
I have asked him to leave twice and he won't. He told me the last time that divorce papers are the only way he will leave, and I told him I could provide them. I have made it clear on countless occasions that I am miserable with our life because we are not partners in anything. I have no say in the business and haven't from the start. I wanted to raise a family together and he wants to build his empire. We want different things. But of course I didn't know that until after we got married because he won't communicate honestly, but instead tells me what I want to hear.
I think I answered most of the questions. Perhaps that will allow for some constructive feedback.
If this is indeed the case, then I'd say to "go for it!"
But please tell him sooner than later, and not wait until the final moment!
Provided that there is no infidelity on either side, and if he's rather accepting and conciliatory of your proposal, then see if you can handle the divorce through a negotiated process like mediation, rather than taking it directly through the court system! It would be far more cost-effective for the both of you!