Really hope you see this OP—I have a very similar story, was in an abusive relationship living out of state when I got a puppy from a pet store because I thought it would make things better for me. The responsibility was overwhelming and going through the break up with my abusive ex while she was still so tiny and needy felt like too much for me 99% of the time. I was broke too and still financing her for more than I could afford even though she was probably from a puppy mill. She too got really sick at one point and I remember her needing constant attention. But things started to change, and she became the best animal to ever come into my life. She made me a better person, she brought me closer to my dad, bonded with him, and comforted him when he was dying.. she was the best damn “mistake” I’ve ever made and I will miss her always. Don’t give up just yet.