<human>: Could you distill the essence of the text into 1-3 sentences?

My girlfriend and I have been together for 2 years, we were very close friends for 4 years before we got together. We have lived apart for these 2 years as I have just finished my PhD and she already has a job. I have stayed over with her for up to a month before and there have been no problems. We're also both very open with one another and communicate with each other in a very open and honest way. 

I managed to get a job in the same city as her which starts on September 1st, and I am due to move in with her this Friday. We were both openly discussing how happy and excited we were about moving in together, that is until this Sunday.

She has now told me that she's worried about us living together and that she wants to take things slowly and 'see how things go'. She has suddenly become very cold to me over the past few days, and I feel like this is a total curve ball to everything we have been planning. 

I really feel like our relationship could end with her sudden change, there will be no problems me finding somewhere else to live, I have plenty of money and have half the lease, it's also 2 bedroom so I can stay there if need be, so will at least have some time and space to move on. It's the emotional strain that I can't handle. I really feel like I don't know what is going on right now. 

Have any of you been in similar situations? Is it merely nerves on her part, or should we end the relationship? I really don't want this to end us as I do love her dearly, but I don't want to make her unhappy if she doesn't want me.
<bot>: Moving in with girlfriend at the end of the week - she was excited, but has suddenly become cold and withdrawn about it - has told me that she wants to 'take things slow' - not sure how to move forward with this.