Sounds like allot of rationalizing.
For instance, if you continue to feel better due to the meds, that should tell you something. And your therapist is interested in how you felt in the past, not how you feel now. Also stressors frequently help cause bipolar mood cycles.
I am still trying to understand my mood changes. My mood cycles without much notice. Frequently, I go from depression to hypomania. Stressors can flip me over to either depression or hypomania.