Ex is denying me access and there’s nothing I can do

My partner was cheating on me with another man and as a result she broke up with me in may after a troubled relationship which I tried to keep together due to the kids.

I had made allegations of controlling behaviour from her towards myself to police but due to lack of evidence nothing was done I recently was made awear of her and her new partners illegal activites of growing and selling cannibus in which I informed the police and due to their slow response she was able to move house and by the time police and solical services acted on my report there was no evidence in her new home of this activity evan tho she has not worked in 3 years but still has a car and able to afford to move from one private home to a next.

Due to me showing concern for my childrens safety and welbeing the mother of my two children aged 2 and 1 years old she has declined me access to my children and I have not seen or heard from them in 3 months now and in fear she will keep them from me out of bitterness and make false allegations to me as to why she is doing this.

I believe she is being heavily influenced by this man to behaviout in this fourgin manner of criminality.

I feel there is no help for me and I may never see my children again.