I apologize in advance for this being long.

So I dated this girl for 2 years, and then she had to move to Kansas for a few reasons. I dated around and slept around a bit to try to get over her, and a few months after she moved I met this girl. I took her out, thinking it would last a couple weeks at most, not intending to get into anything even remotely serious. But after our first few dates, I could tell that this was gonna be more than just a hook up; this girl was different. We went out a few more times, and I just sort of went along with the direction that we were heading. We ended up dating for a little over 6 months, and I was the first serious relationship that she had.she fell in love with me, or at least as much as one can in 6 months. Unfortunately, I didn't feel the same. I had put up an emotional wall after the first girl moved because I didn't really want to deal with that again, and as a result I didn't allow myself to get too close to this girl. She found out about the previous relationship, and asked me if I still loved my ex. I wasn't still in love with her, but I did still have some feelings from her. After 2 years, that's pretty much inevitable. But I wasn't still in love with her. Being as this girl had never been in love with anybody before, she didn't quite understand this. It eventually led to us breaking up, and because I had kept myself distanced from any real emotions toward this girl, I didn't do much to stop it. After a couple weeks of not being with her, I started really thinking about what we had and what I had given up, and also about why things had turned out the way they did. I realized that there was a connection between us and I was starting to share the same feelings. It took her 4 semi-serious boyfriends over the course of another 5 months to even begin to get over me. I didn't want to say anything about my feelings toward her because she appeared to be happy, and I didn't want to do anything to ruin that. I told her the day after New Years, leading to the breaking up of her boyfriend of the time. Since then, she's told me that she loves me, that she wanted a relationship, that she's unsure about getting into a relationship, that she doesn't love me, that she's got too many things going on for a relationship, , etc. We made plans a few times to go out, and all but 2 fell through. Then we ran into each other 2 days before my birthday in a place that was really the last place I would have expected. We made out a few times, all but once initiated by her. She said that she misses me and loves me and can't stand to be without me, but then said that she was still unsure about a relationship.

I'm confused. I don't get her.
Somebody please help.

Also,
I've talked to her about everything, about why things didn't work out the first time and all, and I don't have those feelings for my ex anymore. I don't see anything that could hurt our relationship or stop us from having a serious, long lasting relationship.
There's nothing that I wouldn't do for this girl, and she knows that. I've told her that. I love her.
Last week, she decided that she didn't believe in love. Understandable, being as every relationship she's seen in her life has gone up in flames...our relationship obviously failed, her parents are divorced, both her former stepmom and stepdad aren't very good people, to say the least, and every boyfriend she's had since and before me was either meaningless or also failed.

How do I get around this? How do I prove to her that I really do love her, and that I would rather shoot myself in the foot than do anything to hurt her like that again?

Ok well bad news.
I tried all of my ideas, and all you're ideas too. Nothing.
The other day, I had a long talk with her, and I said everything that I was feeling and all of that and I apologized for not being who she wants and everything, and I finished by saying goodbye and I'll miss her a lot. All she had to say was "I'm sorry," as if she didn't even care. That was last Monday, and we haven't seen or talked to each other since. I was talking to one of our mutual friends yesterday and according to him she's perfectly fine, not sad or anything. In fact, she eve has a new boyfriend as of 5 days ago or something like that. Her birthday was the two days ago, and I didn't even say a word to her. I feel terrible about that, but it seems like she doesn't care whatsoever.
Although it didn't exactly have the best ending, I want to thank everybody for their help and advice on this.
Well, it looks like what I have to work on now is moving on.