Oh I totally feel for you. My youngest was also 4 when I caught XH cheating. He sounds exactly the same, gaslighting me for months, I’d changed blah blah blah. Anyway you play the game. I did the stashing of money and buying things in preparation. It all helps.
what I did:
got my mum to open a bank account and every single time I went shopping I got £50 cash back which went straight in there. Even if I bought something for £1 or £20 I got the cash back. Obviously didn’t keep supermarket receipts and it just was ‘groceries’ DC were “eating me out of house and home” etc etc. all the cash went into my mums account which only I had the card for.
I got all the paperwork I needed out of the house and kept it at my friends house - mine and DC passports, birth certificates, pension, marriage certificate. I photocopied all his bank statements, pension statements, wage slips - everything so he couldn’t hide it in court.
I started buying things the kids would need pretending they had outgrown shoes. That there was special offer on in kids school clothes etc. not that he really bothered but I mentioned it anyway. Squirreled them away too along with ‘bargains’ for kids birthday and Christmas presents.
Paid off the family holiday too, then cancelled him off it once I got home with the divorce papers. Obviously I got the refund not him.
I also phoned the mortgage company, any joint accounts etc and explained the situation. Asked for the savings account to be frozen until the court decided what to do with it. That meant he couldn’t drain it. However he did with another account but that’s another story and the judge made him pay it back…
i kept a diary of everything. Every cruel word or act. That really helped me in court as I had dates, times etc. eveything I needed. When he got violent once I phoned the police and let me lawyer know that I was scared of him and needed to change the locks. The court agreed as it had been reported to the police and as much as he raged about it it was done.
I went round every solicitor until I found one who I knew would fight for me and my babies. The ones who told me I could cry there and offered me a box of tissues were not what I needed. I looked for and found a ball breaker. I hope they still do the free 20-30 min consultation now as that was how I did it. Also got some great advice.
but you will get through this and your children will thrive. My dc are adults now and don’t want him in their lives. They are happy and successful without him and he’s the one who missed out big time. Think he’s regretting it now and is trying but it is too late. They have great lives, they are happy and secure in themselves which they wouldn’t have been if he’d stayed around. You have got this. As you say use the holiday. Do you have a friend or relative you can trust to go to your house while you’re away to go through any of his paperwork and get your documents hidden away for you? No way he’d catch you doing it then!