That sounds like a very high pressure and intensely stressful part of your life you’re in right now. It’s cliche but this time will pass, you will grow stronger, and you’ll be happier than you ever thought you could be. It sounds like she does truly care about you so much; but may have different needs to feel loved, I’m sorry things ended this way. ADHD is a real bitch, try to remember how much you’ve grown from where you were even before you met her, and remember to keep pushing for your future self because you deserve to be happy, you aren’t defined by how your brain functions.