Laurel ~
I certainly hope the MRI doesn't lead to a definite AN diagnosis but your concerns are perfectly normal. We've all been there. I know I'm in the minority here but because you haven't informed your friend about your symptoms and the initial, inconclusive MRI, I think it's better to wait until you have the results of the second MRI scan before springing this on him. If the second MRI doesn't show an acoustic neuroma (or anything else that would explain your symptoms) then there is really nothing to tell him, other than the fact that you have these nagging symptoms and you're trying to find the cause. However, should the MRI definitely show an acoustic neuroma (or anything else that requires medical intervention) you should tell your friend as soon as possible. I assume he would want to know. Besides emphasizing that it's a small, benign tumor, I believe that the manner in which you tell him is crucial to how he'll accept the news. If you're relaxed but straightforward and don't act weird, frightened or break down in tears, he should accept the news rationally and be ready and willing to support you. Remember, as long as the AN is addressed, whether by surgery and/or radiation, it is not life-threatening and, as you know, it will not metastasize. As Nancy ('nanramone') astutely stated, if your relationship is strong, this experience will only make it stronger, as it did for my marriage, which was pretty darn strong before my AN diagnosis.
I hope and will pray that your second MRI is conclusive, one way or the other, and, should it show an acoustic neuroma is present, you'll be able to deal with it effectively and with the support of your friend. I also want to thank you - and your boyfriend - for your service to your country.
Jim