As you navigate this next bit, try, if you can to love your son more than you hate your ex.
What I mean by that is, keeping things amicable between you and your H (I do not mean staying together!) will feel excruciatingly hard at first. Just having him spend time in your house will be the last thing you want. But you and your son could benefit from this for years to come.
By chance, a friend split with her husband at the same time as I split from mine. She cut all contact. For me, it was necessary, due to having very little kids, for him to come round regularly to spend time with them, help with bedtime, etc.
It was excruciatingly hard at first. But, it mitigated the emotional impact of the breakup on the children. It meant that the children continued to live with me, in their familiar and stable home (now that they are older they stay 1-2 nights a week with their dad and that is plenty. Their home is still their home). There is no need for them to move between homes constantly because they see their dad daily.
This also meant that we learnt to co-parent respectfully. I had no idea at the time what a difference this would make. The problem with sharing a child with someone is that you go through this huge emotional journey of ‘leaving them’, only to realise that you are stuck with them forever! Or at least until your son is 18 or so.
As for my wonderful friend, her son has to move every 2 days between his parents’ houses. She has spent many thousands of pounds on court, with more court dates in the coming years. It is very, very difficult for everyone.
There are many 100% valid reasons why someone might chose to go no contact (e.g. abuse), and I am not criticising anyone’s choices. I just wanted to explain what neither I or my friend knew at the time, which is that how you act now will have a huge long-term impact on you and your child.