There are multiple things at play here
50:50 of assets may be fair, we don’t know, but in order to determine that you’ll need to understand the pot of assets available, then determine needs, then factors will be considered including your ages, your earning potential ( ie full time ), ages of children, so on. If needs can be met with 50:50 that may be the award. All assets need to be considered including any pensions, equity, investments
children: you need to let go of the I can’t bare to be away from them view. You need to think about :
what’s in their best Interest
how can they maintain relationships with both parents equally
what pattern of arrangement does that look like
where will you both live
You’ll most likely need to up your income / hours, he’ll most likely have to think about doing more parenting. What does that look like going forward? If he wants 50:50 he needs to have work patterns/childcare in place to support that.
Try to see if you can arrange cms now. Or ancillary relief if needed if he’s going to threaten to stop paying mortgage etc. it might be possible
it’s unlikely long term spousal maintenance will be awarded on his salary so you’ll need to think about income/ applying for universal credit for support
it’s best to disengage and simply seek legal advice to understand your position. By going court route he’ll need to full financial disclosure