Search Results: not speaking after break-up

This was my first relationship I had with this girl and it has lasted up till now. I can't see where it went wrong to be honest. First month, everything went really well, she couldn't wait to talk to me like every day, we texted each other nearly every hour and she invited me round to her house so many times to watch movies and talk. The second month, she starts her final year of school and she begins to talk to me less and less and that was understandable because of school stress and mock exams, we couldn't stop speaking to each other and every conversation got more and more personal (normally after school, sometimes during). We got to the point where we knew we loved each other and we reminded each other that. Now, the third month, she doesn't text as much and she never ever picked up the phone, even though I knew she was available. She went on Facebook to talk to people and when I start chatting to her, she takes ages to reply, and because of this i regularly asked her if everythings okay and she says things are fine. I talked to her the same way I did from the start, she changed from that and now she tells me she's not ready for a serious relationship, even though she basically handled it for 2 whole months. She was the only person I talked to about personal things so yeah I did want to talk to her a lot. She told me that i kept talking to her even though she was really busy with moving house and it really ennoyed her, then there's me thinking "how long does it take to look at your phone and reply with saying hi, wuu2" etc. I did this at like 11 so she can't be busy literally all day. Just the day before the breakup, she hung around with her ex and apparently they got on really well as normal friends. She said to some of my friends "I'm thinking about breaking up with him" and guess what? Literally the day she moved house, she splits up with me, just as she's about to get in a moving van. She called me and I argued in confusion and anger.

The girl I'm talking about was previously in a relationship for just over a year before they broke up around 6 weeks ago.
I started speaking to her around 2 weeks before she broke up with her boyfriend because they were arguing and not getting along. At this point we were obviously just friends and nothing more, we hadn't done anything together ie hugged/kissed.
Around a week after the breakup we started seeing each other often in our local town. We went to places to eat, hang out & the cinema. Things were going really well between us. We were texting when not together & FaceTimed most nights.
Two weeks after her breakup she went to a party with her friends and ended up sleeping with a guy she knew from another college. About one week after sleeping with this guy she told me & was really sorry about it and said it wouldn't happen again; even though she said were weren't in a relationship anyway.
Recently after I got over the fact that she slept with someone else when she expressed that she liked me, we decided that she should come around to mine over the weekend.
She stayed over the night, and we chilled out, watched movies, & we made out for the first time. Later we kissed and cuddled then eventually went to sleep in the same bed. The day after we said our goodbyes as she went home, and we kissed again.
Later that evening we FaceTimed like usual and she told me she "Doesn't want to be tied down" & "just wants to have fun".
What do I do now? I really do love this girl, and she said that she liked me but doesn't want a relationship now. Why would she make out with me and sleep over if she wasn't interested in anything? I don't want to be the guy on the side whilst she finds someone else to get with. By her saying she just wants to have fun, does she mean she wants to get with other guys?

Do I express my feelings to her or find another girl that wants a relationship?