Help me!

I’ve been taking care of my dad for 14 years. He ended up like a baby, unable to communicate and not even aware that we are his children. Because of that, it was difficult for me to find a partner—I felt like I couldn’t divide myself between work, love, and taking care of my father. Three years ago, I met a girl, we became a couple, and we ended up living in my dad’s house so we could support each other. In February, my dad was diagnosed with cancer in his lymph nodes, but he recovered. Now he has stomach cancer and was given two months to live. My girlfriend decided to leave me, saying she didn’t want this anymore, that she felt overwhelmed, and that she needed to learn how to love herself. I accepted it, but days later I found out she was involved with another guy—someone who already has a girlfriend, too. Yesterday, she gave me hope that maybe we could try again, especially since she’s moving just a few blocks from my house. I’m deeply hurt because I gave her everything—she never lacked anything—and this is how she repays me. On top of that, I have to stay strong for my dad, but I feel like I can’t. I feel like she broke my heart, and I don’t know how to overcome it. I’ve even gone to therapy, but I don’t feel like it has helped.