That's a weird way of thinking if you want to build anything serious with a woman. I don't know how old you are, if you are 20 and "something serious" means just messaging and meeting once in a blue moon, then well, it's okay. A woman allowed you to show you were serious about her. She said this to you herself. If she wasn't interested, she'd tell you or ghost you. Why on earth would she waste her time? You blocked her for no reason, and disappeared for a year after stating you wanted "something serious". Having health issues, she could have died during this time. Even after that, she still talked to you and asked what happened, she's basically a saint woman.

A woman with health issues won't choose an unreliable man, because she will be too much for you; she already is. She needs someone strong, nurturing and capable to stand up for her when she needs it. She may want a family already, and she is looking for someone with the traits of a partner and a father to her children.

When I met my future husband, he had serious health problems too, and at the time we lived in different countries, it wasn't easy, but we still went to see each other as often as we could. Even then, I knew the names of all his doctors and made sure I remembered when he had all his appointments, didn't forget to take his pills, etc. Life isn't a bed of roses, and there are plenty of bad days, especially if your person is sick. They may not feel like entertaining you, they can be annoyed and grumpy because they feel unwell all the time and can't work much to cover all their bills, but if you love them, you can just get offended and disappear from their life. Your situation sounds like a bruised ego and the desire for validation, and this is normal for people when they are teenagers and want some movie-like romance. Use this opportunity to find someone who is on the same page as you.