NEED ADVICE- WAH wants to split $ tonight!

[Mom of 2 2B]

I posted this in newcomers but wanted to post here too in case this group has any good advice- quickly. Thanks! (I wrote it last night so change the dates to yesterday and tonight- he wants to discuss this tonight).

A week after my H dropped the bomb and left I put a hold on our largest investment account so that it will require both of our signatures to do anything. I had no idea what was going to happen and didn't want to take any chances. I told him I did this, but he apparently forgot b/c he called me yesterday furious that I had done this. Long story short, he realized that a) I probably told him and he forgot, b) I did this a week after the bomb when we weren't talking and things have since gotten much better (he was insulted that I did this based on our current R with decent communication), c) he was being a jacka$$. He called me 2x to apologize + texted with same.

Tonight he told me he was going to get the form to release the hold. I asked why- what did he need? (the original reason was supposedly tax forms- sounded odd to me since he usually does taxes at the 11th hour). He said he wanted to split the account. Again I asked why- he said he felt uncomfortable w/ the sitch, didn't know what was going to happen in the future (get back together, get D which he's saying he wants), and might want to buy a new computer, motorcycle, etc. and wanted the flexibility to do so. He said he was just going to split the account down the middle. I am uncomfortable with this b/c he is a lawyer + knows more about this stuff, I have been told that my state does NOT split down the middle (he says it does), we have newborn twins + I would think a D court/mediator would take that into account, et. Many factors to consider. Financially, he entered the M w/more $, but I worked while he went to law school F/T for 4 yrs, I have made substantially more than him for a long time, he has been unemployed several times, etc. Point being, I feel I contributed more than half.

I bought time by saying I wnnted to think about it + that I felt he was doing this to "punish" me for placing the hold. He hugged me + apologized, + texted an "I'm sorry for springing on you let's discuss tomorrow night." How do I handle this tomorrow? I'm very uncomfortable doing this w/ my lawyer H w/out my own legal advice, but also don't want to force the D issue as a result by hiring a lawyer and starting a big split of belongings. How do I DB while protecting myself? ADVICE PLEASE!!!