Earlier this week, Amber Portwood's ex Andrew Glennon was awarded full custody of their 4-year-old son
In response to the court's decision, 32-year-old "Teen Mom OG" star took to Instagram on Thursday
This outcome has devastated and heartbroken me
According to the mom of two, she has worked hard to better herself and improve her relationship with her children
In spite of my past substance abuse and mental health problems, I believe that a person should not be bound by their past mistakes
Portwood claims that she has undergone multiple psychological evaluations to prove herself, adding that "people who went through therapy and classes should not continue to be punished."
She concluded her post describing the legal battle as a "nightmare" and vowed she would never give up fighting for her children