I am presently undergoing a treatment on that, and the treatment is getting prolonged due to drug resistance. and i need to tell him this.
If the infection was indeed not contacted via sex (which is very common, it's easy to get such an infection), and he does not believe you, then you have a significant problem in your relationship. I would be concerned about a man who does not believe you.
Have there been other times where he has not believed you about something?
no, he had always believed me
OK, good. Then is sounds like perhaps you are just anxious. I suspect that you are upset by the condition (which is extremely unpleasant) and are anticipating that he will have a negative reaction --without having any history of him being like that.
So, trust that you know who he really is and that he will be loving and caring when he hears that you have something going on that is bringing misery to you. Let him share the burden of that with you!
I hope that they find a medication that will actually help you and that you get better quickly.
Please feel free to follow up with me again.