Not sure if I should end things with my girlfriend

I am 24, she is 21, and we have been together for around 11 months. When we met, it was very intense, so much chemistry, and we thought we were perfect for each other, that sort of stuff. We are in an LDR, but I am soon going to work there for the foreseeable future, and getting a flat with her. However, there have been a few things and comments made during our relationship which really makes me question whether me and her are right for each other. I have questioned how seriously she takes the relationship. On one hand, she is happy to live with me, and has talked about that in an excited manner in the past. She has said that there is nobody else for her, she wants to be with me forever, and things like that. On the other hand, she has (usually when drunk) made comments that have made me rather insecure. Once, a few months into the relationship, she said that she might meet the one for her one day, which made me question what on earth I was... On another occasion, she told me that if she ever broke up with me, that I would get over it and move on. She said once, also when drunk, that she wishes she had slept with this hot guy in the past (who she no longer sees or speaks to). She always used to tell me when a guy was checking her out, and told me a few of her male friends were attracted to her. She liked one for years before me, and I had a lot of suspicion she still liked him for a few reasons... their friendship seemed very flirty/teasing-based, and apparently he liked her too. She assured me she was with me and I was the only one for her, but was liking pictures of him on facebook, calling him little names, and stuff like that. This guy acted like he did not like me at first, to make matters worse. She can be very moody with me for no reason, and act overly sarcastic/act like my comments are not interesting/important. Sometimes, I feel like she makes barely any effort with conversation, as if she cannot be bothered. At points, I actually feel like I am talking to a girl I like but I am unsure how she feels, rather than my girlfriend. She seems to get annoyed with me very easily sometimes, but never says sorry. It is constantly me who is saying sorry (even if it seems like she was in the wrong), and I feel like she is manipulative in that sense. She has sworn at me and called me psycho and a weirdo, stuff like that. To type all of this out, it probably makes her sound like a horrible person. But a lot of the time, she is really nice, and that is why I stay. A few months ago, I broke down and told her everything, how I felt, and she was very upsrt and said she did not want to lose me. She buys me presents, helps me with stuff, and has been there for me. She can really be lovely, and I loe her a lot, , but I dunno what to do :?

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