Huntington's is a rare condition, even though there's a few of us on this thread with personal experience. But it's an absolutely devastating disease that attacks the individual on all fronts - cognitively, emotionally and physically.
My dad was diagnosed with Huntington's and I saw firsthand how this disease ravages the individual as I was his sole carer. We were just about to move onto PEG feeding as he couldn't swallow properly any more when his lung suddenly collapsed and he died (life long smoker who developed lung cancer), so he never had to endure the very final stages of the disease.
My kind, funny, compassionate, loving dad became manipulative, selfish, demanding and aggressive. Sometimes he was still the person I knew and loved, but he was like a toddler in an adult body, with no thoughts about how his actions would affect others. I could tell you so many stories of his HD and how it changed him. Some genuinely horrifying times like when he'd been told to stop driving, I took his car keys and he pinched them back, then went driving round the streets on the pavement, and we had to send the police out after him as we were terrified he was going to knock down a child (it was 3pm). Other times were just bonkers, such as when he locked himself into the command centre for all the CT scanners at the local hospital and wouldn't open the door. Just sat in there with all this multi-million pounds equipment looking very pleased with himself!! (I'd left him on a chair to get a nurse to remove his cannula).
I am at risk. I've not been tested.
I always planned to be tested before I had children but fell pregnant accidentally with twins. I was going to terminate because I know how much people like me are hated by others, we're told explicitly that we have no business having children and potentially passing on a deadly disease. I went to the termination clinic but I couldn't bring myself to do it.
I had genetic counselling when I was pregnant. The majority of people at risk like me choose not to be tested as once you have the knowledge, it weighs very heavily on you - and you also would have an obligation to disclose it under certain circumstances. I'm now 46 and not showing any clear signs of the disease so far so I continue to hope that I might have escaped. I can't face the testing process - it's drawn out and longwinded and I can't cope with it hanging over me. Plus what's the point? Nothing they can do to help, and I'd just be sat here waiting for a miserable death. No thanks. There's a high suicide rate in people diagnosed with Huntingtons and I can understand why.
I was on a research panel for Huntington's and really heavily involved with it all. There is also the Huntington's Disease Association who have regional advisors who can support you, plus online forums to talk to others. There are usually regional meet ups too for both those with HD, carers and those at risk.
Although HD affects everyone the same way in the end, it can start differently. Some people are more affected physically while others are much more affected cognitively and emotionally. The start is insidious. Subtle changes in mood, bit of memory loss, bit of an occasional twitch. Then nightmares, growing sense of restlessness, difficulty concentrating. But all of these things could equally be caused by stress....it's so hard to pinpoint and you can be driven bonkers wondering if it's the HD that's kicking in or just the usual stresses of life.
I have a partner who is fully aware of my at risk status but chooses to be with me. He understands what this means. I've been on a real emotional journey with this over the last decade or so, and it's really hard sometimes just to try and forget that there's a shadow hanging over me.
My dad had it, and two of his four siblings have it. His mum died from it too. It's a bastard, bastard disease that destroys the person and the family.
I totally get that lots of people wouldn't want to be with someone who had a positive diagnosis. It's fucking hard, and you more or less know what the future will hold. And it's a shitty one. If you're diagnosed, the only possible respite is being knocked down by a bus before the disease takes hold. Once symptoms start to show, a person could live 10-20 years before they eventually die. That's a long time to be a carer, especially of the magnitude that's needed for HD.
OP, it's really good that you're thinking about this seriously now and you're right when you said dumping him for being HD positive is brutal - but it's understandable. If someone finished with me because of HD, I'd be absolutely devastated but I would understand why. It's not a path for everyone. The only thing I would urge you to think about is his feelings too. You're thinking about how bad you would feel if you fell in love with him then decided to walk away - in the gentlest possible way, how awful do you think he'd feel if he fell in love with you and then you walked away? If you can't do this, that's fine. It really is. But please knock it on the head sooner rather than later if that's the case because he doesn't have time to piss away. You need a very difficult and honest conversation with him about this.
Sorry for the length of my post, but HD has engulfed such a huge part of my life for years with my dad, caring for him and then my own fears about being positive, it's just something that's so, so close to my heart. I really do wish you and him all the best.