Welcome back ladies and gentlemen of the internet. Partnership is all about reciprocity and care. Without an equal level of give and take, there's no chance for a healthy, long-term, and happy relationship. If you cry out in pain and your partner ignores you, you'll never have someone you can rely on. Reliability is going to affect everything. From individual actions, to shared bank accounts, to buying a house, having children, or moving abroad. No one likes to see a pathetic defense in the face of opposition. Owning up to one's downfalls is a great human strength.
In this particular story, OP has spent 3 weeks in the hospital for emergency pancreatitis, a severe and potentially life-threatening infection. It's almost cruel that her boyfriend ignored her pleas of pain. All she wanted was a ride to the hospital and he refused. He even refuses to message her or visit her in the hospital. Red flag central. Who else would break up with him?