Shall I continue to be this girl's friend?

[Kieron]

Throughout the last few years I have suffered with anxiety and depression. I have been having panic attacks for the past few months. I have attempted to kill myself a number of times because my dad had left, and all my parents would do was fight. I recently have had a female friend, (Don't go saying " "oh you're just depressed because you like this girl" I've had depression way before I even knew this girl because I've had terrible confidence and low self-esteem and I get panic attacks) we've been friends for a few months now, we're not extremely close but we help each other out and talk to each other quite often. We text and phone quite a bit and she often gives me lifts to college. What I don't get though is that she always tells me her problems, yet when I try to help her out she never responds or says thanks. If I apologize for something I do wrong, she never responds. However If I act moody or quiet around her or say something sarcastic towards her, she doesn't get offended and always responds calmly, but when I be nice to her, it's like sometimes she doesn't want to acknowledge me. She told me a while ago for me to always come to her if I have problems because I get panic attacks and I suffer with anxiety and depression which has gotten worse lately because of family problems. What's up with her, does she dislike me?
Also another thing is that she is being grumpy towards me the last few days because my male friend had said some things to her on facebook, I didn't know about this until she told me. She was telling me that if he was to say things to her again then she would never be my friend.

Also don't say she's on her period, because she's acted like this for quite a while, and now for the last few days she's being moany at me because my friend had said some things to her. I even made my friend delete the fake account that he talked to her on, and she still didn't care. When I spoke to her a week ago, I told her to have a nice christmas but she just sent me a miserable text slagging my friend off.

I also texted her today and we getting on fine, I told her that I wanted to tell her something when I see her next week. She kept nagging me to stay on the phone to talk to her. What I don't get though is that when I was about to end a conversation, she kept sending me texts, but when I started to reply more enthusiastically she then started to reply with short answers. I tried making a joke earlier too when she said that she wanted me to pay her a fiver for petrol money for when she gives me a lift to college, I replied with "bugger off haha" She started to freak out, I told her I was joking and she told me that she hated joking about. What do you think the deal is with this girl? I guess she sort of is my friend because she answers my texts and phonecalls. She knows about my depression and anxiety and she told that I could always go to her for help. However I don't talk to her about it because whenever I see her she snaps and gets mad over the tiniest of things. She'll swear at almost every car when driving, she called my friend a psycho, which is why my friend said something to her on facebook. When this happened she kept complaining to me about my male friend calling him all sorts of names, I helped her out as best as I could and she didn't thank me or anything. Every time I bring something up she always seems to hate it, she said she hates driving, texting, talking to people, joking about. She is an attractive girl too, She could probably get any guy she wanted, but she never smiles or has a laugh with people apart from her one female friend she's constantly with.
I feel bad for talking about her like this but she makes me feel like I'm the bad guy all the time, she even told me that she wouldn't be my friend because my male friend had argued with her. The first few months I knew her she seemed the total opposite, she was always really nice to me and gave me support. What should I do?
By the way some dick in my last question called me a whiner, if you're going to be a dick piss off because I'm sick of people like that in my life, I've had people complaining in my last question saying that I should always give her petrol money. I do so don't jump to assumptions I just get annoyed that I have to pay her a fiver a day when the college is only 30-45 mins away, and the fact that she doesn't make her other friends pay.
I'm sorry if I seem a horrible person to you people but the last few times I've posted this question I've had people calling me whiner and insulting me, when they don't even know half the story. If you're gonna have a go at me then don't answer my question because right now I don't think I should be dealing with negative critical comments especially when I know for a fact that I'm not in the wrong.

[Sandi]

Maybe she doesn't say anything when you tell her your problems because she doesn't know what to say or there isn't anything she can say to help. People can't tell the context or tone of a comment in a text so don't joke when texting or emailing. Her feelings might be hurt about your friends talking about her is she is really your friend you should tell them to grow up and stop hurting peoples feelings/bullying on Facebook. But most of all if you two are friends talk to her about the way you feel in person or in an actual call so nothing can be confused. Texting is a horrible way to communicate when saying anything other then short things like I'm here or on my way.