But he doesn't want to start a new family.
It's just a spiteful little attempt to up the ante on the situation. To get an extra new dig in disguised as a 'reason' to bring this up to you.
Ignore it, and everything else he says. Just ignore. It's spite and nastiness from a nasty spiteful person and what you need to do is raise your eyes above that, to the horizon where there is a life Without Twatty Face!
Yes of course you are scared.
BUT.
First thing - there is no 'what he will give you as a settlement. Bwah hah hah, I don't think so. What you do is get a lawyer, file for divorce, and THEY decide, or rather the courts if an agreement can't be reached. Your marital assets belong EQUALLY to both of you and that includes his salary and his nice fat police pension. Payment out of the settlement at the end is a possiblity, if you are skint. In fact - do that first. Get recommendations if you can, and go see the most rottweiler solicitor locally (or reasonably locally) you can find, and have an advice session. That will be real knowledge = power.
Secondly, if you are scared of his reaction, say nothing yet. Get your ducks in a row - proof of all assets, see solicitor - sort out what you want to do - and then tell him with someone else present, ideally. It's usually advised that you stay in the house, but if you need to leave, then do - with the kids. Could you stay with someone?
It can all be done, and a lot of it can be done without actually having to talk to him or discuss anything much now without it being in an official setting.
And - this morning's little gem. Next time HE brings it up - you calmly answer yes. I would like a divorce, I'm glad you think so to. (Make damn sure you've bagged the best local solicitor before this happens...) Then when he throws his nasty shit at you in a fury, you don't bite. Yes, good point. We'll both need to move on, I agree this should be sorted as soon as possible. Yes, the children will be affected but I believe it's better than the current situation.