Changing from Partner Route to Dependant Route

[Duped_78]

Hi all.
This is my first post here so please correct me if I’ve got anything wrong.

I am looking for some advice regarding a situation I am in.
I met someone who “forgot” to tell me they had no leave to remain when we began our relationship, only mentioning it when we started living together. There was a failed asylum claim and the possibility of another being submitted. This eventually did not happen due to the political situation changing and making asylum a no go. Once our relationship was established for 2 years an application was made on that basis...I also gave birth within this time too.
Leave to remain was granted through the 10 year relationship route...an initial period of 30 months.
As soon as this happened (same week) my now ex partner changed dramatically. His attitude towards me, my family friends etc went down hill. I also began to realise that I had been emotionally abused with some physical abuse too. I spent a few months researching as I thought I was going insane with what was going on. I’ve had support from a domestic abuse service who reassured me that I was being abused but I allowed myself to be dragged back into the madness. Fast forward to last month where I asked him to leave due to his abuse behaviour in public. Police aware and encouraged me to make a formal statement but I am afraid.
He has been playing mind games since this, has not seen our child as I said something has to be discussed about expectations/safety etc and he refuses to engage. To be perfectly honest, I don’t think he’s interested.
I have an appointment with a solicitor next week to see what my options are to secure my child as I am terrified he tried to take her.
Can anyone tell me what time situation with the home office is? Do I inform them the relationship is over? He has categorically refused, says he will remain without leave etc. To my knowledge he is not currently employed as he messed up a couple of jobs due to the break up.
Will he be able to change his leave to remain easily, he informed me that due to the child he can remain here for good now.

Many thanks in advance for any information and apologies if I posted this in the wrong place or anything!