Legally still married but been separated for 10 years would you date them all call it quits?

My boyfriend and I have been dating now for 9 years he has been separated from his ex ( still legally his wife) for over 10 years. They both appear to have moved on she has been dating someone for 6 years now and he has been dating me for 9. They share 2 sons both who are now of the age of 21. They have divided all the assets. Although I have no desire to ever get married I do want that security of knowing that my boyfriend there is a future and that I haven’t wasted 9 years of my life. No I do not see myself as the other woman as I said they are living in separate residence, they are both with new partners and all assets have been legally divided they just have not divorced.

So why is it neither of them won’t actually file for a divorce? Should I walk away even if I do love him if they won’t get divorced?

Legally still married but been separated for 10 years would you date them all call it quits?
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