You think your the only one with problems.

A couple of years ago my sister was having a nervous breakdown.
She'd just split up with her boyrfriend because he was sleeping with someone else and he posted pictures of them together on facebook. He was also humiliating her on facebook with one of his friends. Making her look bad to everyone.
She has a severe mental disorder that makes her so depressed and she hates herself so much. Her image repulses her. She's spent months in hospital with it. Locked herself away for 5 years due to being so frightened of the outside world.
She just lost a friend to cancer.
Her dog had died.
She'd just broke her arm in a cycling accident.
She over dyed her hair and it was falling out.
She ended up at my house one day because she couldn't take anymore. All this happened within a couple of weeks.
well i was going through stuff too and said to her " you think your the only one with problems"
Why is she being so touchy. She's obviously took it the wrong way and it's her fault for being so sensitive right? She neds to put all her past behind her too. Ok she's had a bad alife. i know she's ill. But why take it out on me?
Anyway. we patched things up a little, but she's hit a rough patch recently. So i said it to her again, she had ago at me, so i told her to go **** herself. She needs to put it all behind her doesn't she? She's threatened to kill herself recently. started throwing stuff away. Probably attention seeking or something. We've fallen out, so i've stopped her talking to my girlfriend because she's on my side and says it's her fault for being so touchy and i've unfriended her on facebook for being so pathetic.
Anyway. My mum has been skint for years and she's been helping out with a few quid to help her get food etc. I've refused because I work. She doesn't. Why should i chip in, i work for it. How selfish of her to ask right?

Anyway. It's her fault we've fell out. Do you agree? She wants me to say sorry. Why should i. It's not my fault?
Thanks.