Thanks for the valuable inputs..
Well you see it is possible that your allegations directed towards her for being infidel is owing to your development of paranoia , delusion of jealousy which is also called as Othello syndrome and hallucinations , all of which possibly having developed due to overloading of anti parkinsonism drugs since each of them are known to produce these side effects.
So i believe you shall give your girlfriend benefit of doubt as it is quite a possibility that your belief regarding her infidelity has developed as a part of paranoid reaction arising from the excessive use of anti parkinsonism drugs.
So i reckon you should get yourself evaluated by a Neuro- psychiatrist or Neurologist for paranoia and delusion / hallucination and also get your drug regime reviewed and revised in order to overcome your present situation which will also lead to revival of your ties with your girlfriend who possibly is extremely hurt by your allegations.
I hope this helps you to see the possible reason behind the predicament you find yourself in.
Wish you all the best. Kindly discuss this wit your treating doctor and seek referral for a neuropsychiatrist or neurologist , if already not seeing one.
Wish you all the best.
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