I didnt know where else to ask and need help. I have a friend who is always coming round to my house when I'm not working to walk my dog at night. I dont mind sometimes but it's become more and more frequently. I live with my mum and son and when mum goes away I dont work and enjoy the quiet nights, until she comes round. I have noticed recently that when we go, I dont say a word and she vents all the time, never ask how I am, always issues. I enjoy the walks on my own to clear my head and relax but she says she needs them to help her. I love her dearly but its becoming too much. She gets on great with family, because shes either at work, mine or sleeps at hers. I look at rota for work and see when shes working and when I can have a night to myself. Its getting draining and I can see I'll blow up soon and loose the friendship. She doesnt have many other friends she sees that much as they busy. I once said I wanted to have a walk on my own and she basically had a tantrum because she needs to have this to feel better, which made me feel guilty and feel like I can't say no. It used to be my way of dealing with my issues but now i dont have that anymore.
What can i do to still keep her but tell her to back off nicely?