I can't get my ex gf off my mind. I'm not sure if she still even cares or has feelings for me anymore. Help?

Me and my now ex-girlfriend started talking to each other over a year ago and dated for 8 months. Our relationship was very good overall. At first she had a little trouble getting over her previous boyfriend.. and I helped her through that. We called and texted every single day. We would talk on the phone for at least 2-3 hours...and occasionally over 5 hours. We had some fights here or there. She is very needy so when I messed up a little she would blow up on me. If I didn't text her back for a while or call her during the day she would be upset at me. She hated disconnection especially when I was on vacation. But the fights would not last long at all. We both trusted each other...she knew I would never cheat on her, and vice versa. Later in our relationship around 6-7 months in, our conversations got a bit dull. I blame it on the fact that we talked so much we ran out of things to say. Well, maybe she did...I always had things to say...but one day she had complained I talked a little too much and never listened to her...so I slowed down a lot and held back so I could wait for her to start talking up a storm. She did sometimes...but not as much as she said she could've. There were sometimes that I felt she didn't love me, but that could be due to the fact that I'm a pretty self conscious person and I petrified of people growing bored of me. Which is sort of what happened to us. At the end...our conversations really weren't conversations at all. We didn't really go anywhere that much, things got a little boring for both of us. I wanted to switch things up get the magic back, but she didn't seem to want to make any effort. She had started talking to this guy she met on OMEGLE from boston (we live in new york). She did this a lot, when she was really bored and I was busy so she couldn't talk to me which was okay with me, its good to talk to new people sometimes. But this one guy she started talking with interested her. I guess he filled the void that me and her had in our relationship. The day we broke up, she admitted to me that she had been talking on the phone with this guy for the past 2 days after her and I would hang up. I felt so betrayed and started yelling at her for an hour. Then finally we broke up with each other because she said she still loved me but was very confused if she still wanted me or not because there was "no spark". She seemed to take quite an interest in this guy. Note that I did so much for this girl...I took care of her as much as a teenage boyfriend could. I lived about a driving distance from her house...so we didn't see each other every single day. I made sure she ate...did her homework...went to sleep at a decent time. She's told me before that I was an amazing, awesome, perfect boyfriend. I still love her and care for her so much, but she doesn't really seem so effected by it. I thought that after all we had...she would feel something or at least show it. But I read her facebook posts and statuses and they all seem normal. I dunno if it really hasn't effected her or she's hiding it well and using this guy to make her feel better. All I've heard from her friends is that she has said she's worried about me. I didn't contact her for 5 days, until one day I told her personally that I was doing alright (which was a lie) if she cared. I talked to her for a little bit, note that I DID NOT BEG or anything...just small talk. But the way she was answering me was so cold. And she suddenly said she had to go and signed off quickly. I know i shouldn't have contacted her that quickly because at it leads to is awkwardness. I miss her so much and miss talking to her and I'm having trouble getting over her...I feel so lonely and she is frequently in my thoughts. She has lots of issues, she used to cut herself but note that when she was with me she only did once and that was because of her parents. She has said several times during the course of our relationship that life is too much work...and people are too hard to impress and everything is stressful. I tried to be the one that she was completely comfortable with, and I did make her feel a lot more comfortable than any one else did but she still had issues. I'm not sure if she knows what she wants, and i think she just enjoys that "new guy to talk to/flirt with" sort of feeling. she loses sight of what she needs and only for what she wants. I'm just so scared because I'm not sure if she even cares how hurt I am. I;m not sure even after all that, she even has feelings for me. It hasn't even been a week though. Part of me hopes she will realize what she lost....and another part of me wants to move on. Please help!