<human>: Could you distill the essence of the text into 1-3 sentences?

Backstory: We've been dating for a little more than three years now. The first two years was long distance while I was at college then I had to drop out because of money and I moved into a shed in his step mom's backyard so I wouldn't have to live with my parents. We got our own house to rent in April 2014 and the lease will end in April 2015. 

This summer, my mom was diagnosed with anigosarcoma, a rare cancer. There is a tumor in her left hip socket, so she's always in pain and can't walk anymore. After some visits with my family I realized they desperately needed help around the house. My dad and sisters were extremely depressed and were falling behind on basic everyday chores. I decided to move back in and help out. I moved in on November 11th.  My mom is thrilled to have me here. 

Now that I'm here, I don't want to go back to my boyfriend. All the things that I was letting slide for a while really started to bother me now that I was away. There are so many red flags that I ignored because he made excuses for them and I felt like a bad girlfriend if I didn't side with him. When I told him I was moving to help take care of my mom, he was more concerned with when I was going to be back than how my mom was. 

He is my first boyfriend, kiss, sexual partner, everything and I don't want to leave him but for a while now I've felt more like a babysitter than a girlfriend. I have to leave him so he can learn to do things on his own and so I can take care of my mom with undivided attention. 

I don't know how to do this, especially with the house leased to both of us and me paying the power bill. I'm so scared he'll do something crazy to get me to stay. I just need advice.
<bot>: I need to break up with my bf of 3 years because of red flags and I'm taking care of my mom with cancer and don't know how to deal with the lease and stuff.