Love makes us all do foolish things that we think are okay in the moment. The moment could last months or years. Love can be blamed, but it's our own individual actions that have caused the consequences. I think I am fairly healthy for a CF'r due to two rare genetypes and most of my lung function, however I would never chance being near a CF person, let alone being in a relationship with them. Life is worth living, and you can't very well live if you are becoming increasingly sicker and potentially even more fatally ill from the person you love.
In perspective, with a rough upbringing there was a point in my life where I thought I should find a girl/woman who had been through a lot to, so she could relate to me. What I ended up with what a woman who had been through more abuse, family drama, and life throwing her bad hands of cards over and over. This caused my life to be very negative, and we disagreed on a lot of things. Ultimately, I was the best BF she had, and even though we fought she knew she would not find someone with his life together or as good as a guy as I was, even though our personalities weren't compatible. This went on for about 7 months. Whereas she could relate to the broken home, foster care - kind of life I had been living, she was not a good role model for me to get in a better place in life. I've since given up on that idea and decided that finding someone with good values and morals would be better in the long run. So I found someone who has had almost NO life trauma and drama, and she truly is a gem. She makes me want to be healthier, makes me want to live better, feeds me healthy foods, tries to get me to exercise with her. Someone positive and motivational who I have very little in common with.
Why did I go into that rant? Well, because simply at the time I thought that finding someone who I could relate to was important, and so I looked for it. I found what I was looking for ( as you will if you look hard enough ) and it was a bad decision. I loved her and she loved me, but we were terrible for each other. Love and happiness are what some people make their life all about, and I'm not saying this is bad. What I am saying is you choose to make the life you live, and love the people you love.
Under no circumstances should you value love with someone else, over the love of your own life. Dating someone with CF and having CF is bad for your health, and your life. It's not worth the risk to damage your own life and happiness.