After CBT i thought i was do optimistic and thought i was "cured". It turns out that i can still have the same thoughts and feelings as before, especially when i stop doing the things i worked hard on in therapy. Previous thoughts and ruminations come flooding back. Old habits die hard

There is no cure for OCD, and you'll almost always have intrusive thoughts. The key for CBT and ERP is to lessen the effects it has on you. Relapses will happen too, hopefully after time, they just become less and less detremintal on you.

that is why we have to continue implementing the concepts we learned in therapy. when we start to slack off, our old habits start coming back. as FinFin said, there is no "cure." therapy is not about curing mental illness or getting rid of it. that is not a realistic goal for any therapist or any mental illness! what a therapist does is teach you important coping skills that allow you to overcome these difficulties on your own. you have to keep up with them or the symptoms will return! it's not just OCD, it's every type of mental illness.