I ended my 8 year relationship with my son's father at the start of October 2024, I wasn't happy, he had no passion or joy for anything, his main priority was always make and save more money, not the worst thing in the world but it had an impact on everything we did and he would always make comments etc about our money and other people's money and what they spent their money on. We had agreed an amount that I paid into our joint account and I wasn't always the best as saving my own money but the money I was meant to pay into the joint account I would always pay in and I paid for 85-90% of clothes for our son, 50% of clothes for his daughter from a previous relationship that he had 50/50 custody of and 80% of all xmas and birthday presents, alongside little treats for the kids and days out with my son (as a family it would usually come out of the joint account). I also had a disabled father, and my mum would ask my sister and I to sometimes stay with him if she was away and the last time she asked was shortly before we broke up and he instantly said "no, you're not doing it. She can sort something else", which was not an option. If I ever expressed any discomfort in the way I looked, he would always say "eat less, move more", he never made me feel like he loved my body in any way, shape or form, to the point I asked him several times if he had an issue with the way I looked. I felt lost and sad all the time and I think I had checked out of the relationship long before I actually left. We now co-parent 50/50, 4 days with me, 4 days with his dad.
I am now nearly 6 months out of the relationship and 5 weeks ago I reconnected with an old school friend and things have progressed. He lives approx 150 miles away and he visited me 3 weeks ago when my son was at his dads, they didn't meet. I then visited him, again on my son's days with his dad and I am planning to go this weekend, yet again my son is with his dad and my visiting doesn't impact the days or times he is with his dad.
His dad seems to feel entitled to know exactly what I'm doing all the time when my son is not with me and I don't feel like that's necessary information for him to have, I understand that he needs to know I'm going away but he doesn't need to know exactly where I am or who I'm spending my time with. I have not introduced my son and the guy I'm seeing yet and I'm not planning to for a little while and before I do, I will tell his dad that I am seeing someone and have been for a while and that I want to introduce him to my son.
My question is, up until that point, do I need to tell my ex that I'm seeing someone new? I don't want to tell him and then things ending with the new guy, I know that my ex will make comments about how many people I see etc if that was to happen and I want to enjoy these early stages of getting to know new guy properly without being criticised etc, because everything I do is analysed still as though my ex still controls me.