Is my fiance mentally "slow"?

My goodness. That sounds monumentally frustrating. Does he have an post traumatic stress or anything that you are aware of? I wish I could help you. This seems like there is obviously some sort of mental lapse there. Is there anyway you could address the situation where he wont feel threatened. Somehow say like hun I am feeling frustrated by the way things are transpiring. I feel we need to sit and come up with a firm plan so we know what we are doing. Its important we stay on the same page. I dont want you upset about feeling you need to do things when that is not necessarily the case. If you come up with a solution and it comes back to the same old situation perhaps you could contact a health facility in your area. Maybe they would have better insight and could help you. It sounds like if it isn't addressed it could be a very challenging relationship. To know what you are dealing with would make it so much easier. It may just be a simple thing like getting a to do chart and writing - go to such and such to look for rings or take (whatever your name is) to this place or that place, Maybe the visual reminder will help his brain from skipping ahead. I don't mean this in a condescending manner at all. Just a suggestion. I hope you find the answers you are looking for