She said she needed space after three days of dating, and she got a boyfriend a week later. I still really miss her, and she told me she still likes me.
Given the short amount of time you know this girlfriend, there is no history on which to make a judgment about the likelihood of what she will do next.Certainly she is confusing by telling you she likes you and is with someone new. And not giving you any explanation as to why she made her decision.I'd suggest two possibilities.Speak with her and ask her if she considers opening your relationship with her.Or, simply wait and see what she does when you contact her in a friendly way.Pay attention to your own satisfaction level.If you get more answers from her which aren't agreeable with you, then it is time to put the hope for this relationship behind you.Then you'll have clear space to find someone who is as interested in you as you are in them!