i don’t know what to do

hi im staying in a place with my sister her bf and a couple roommates. my lease ends soon and my sister is getting a house and she wants me to go with her, but my ldr wants me to move in (they live in a different state and a couple hours away + with family) and i want to be with them but im so scared to be alone and without my sister. my partner said if i didn’t they didn’t know if they could continue the relationship so i kind of agreed to move in but it doesn’t feel right. im scared..