You might not be looking for judgement but you are apparently looking for answer.
As much as you might not like it...This is the glaringly obvious one...
The "help" is people telling you the truth..that your living set up is a massive issue
Knowing him for x means nothing...
Tonight my 2 yr was apoplectic my DM put him to bed..sweaty hyperventilating and dry wretching because inadvertently my dm "whisked him off" and he was (presumably) like wtf is my mummy. I want mummy.
Total outreaction for an adult but... hes 2
And my DM is a woman he sees 4 x pw who looked after him and put him to sleep many many nights while I was in hospital / havong surgeries / recovering and thry ADORE each other.
You have some bloke in your child's (already new and scary) living space...and this not only is a new person but their presence in the home changes the attention you give your child / the interactions you have.
As a mother of a 4 and 2 yo You could bet your bottom dollar I'd be telling my new DP we need to live separately if the alternative is either a distressed child or less than joint custody.
You really need to sort your priorities out.
I hope your child's father is decent and hands on.
In your shoes i would be devasted and desperate and will to try anything. ANYTHING.
your posts read as if you are irritated and over it. Your new ride is here to stay and you are over the whining. You want it to stop and you want your 3 yo to stfu and get with the program....