<human>: Summarize the given text in a few sentences.

My girlfriend has asked me to give her some space. This surprised me completely. We have been together for two years, we've had our ups and downs but we haven't argued in months. Everything was fine for both of us. But last week she left to visit some friends that don't live near her, and ever since she has been with them she has been acting 'awkward' and then she said she needed/wanted some space. I obviously said that I'll give her the space she needs, but what should I do/think of this? Nothing was wrong, and now suddenly it's different.
<bot>: Relationship of two years has been going great, girlfriend goes away on a trip to her friends and suddenly wants/needs space. What to think/what to do?