Hope, I live in a no fault state too. Please ask your lawyer what I recommended. I had no idea about any of this until I spoke with a lawyer. And I realized, had H had the balls to file in January, there would have been no marital misconduct according to the state because filing is enough proof he really wanted out of the marriage.
Please please really reconsider this legal separation. He hasn't gone straight for divorce and there's a reason...you need to find out what it is.
The people I've met who've gotten legal separations, two of them, it was a matter of religion for one man and for the other, it was financial....the spouse who wanted out had amazing health coverage but didn't want to leave his spouse high and dry, so they legall separated, so he could date and she couldn't hit him with marital misconduct in the future. They are still legally married and both living with OTHER people. Weird, but true.