Relationships are really tricky, and there’s always often doubts floating around, so this kind of request is natural especially for an independent introvert. She has requested space, and the best thing you can do is to give her some, and not try to ask too many questions when she’s not ready, or prod her for answers. But be open to talking, and make her know you won’t get angry, jealous or judgemental. I’d also try to keep a happy tone, never sounding like you’re depressed or already feeling like the relationship is going to end.

If I was in your shoes, here’s what I’d say:

If you need space, I’ll gladly give it to you. Relationships are always tricky, and I know that you have your own personal needs, so I hope we can figure out what works for us. If you have any concerns, you can always share with me and I’ll listen without getting angry.

So if you need some personal time to reflect, I’ll respect that. I value you and I hope we can figure things out.

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Then maybe send her a message after a week or two and see how things are going. “Hey, just seeing how you’re doing. If you’d like to chat, let me know. If not, have a good weekend!” And if she doesn’t respond, don’t message her for a while.

I’d also not show any evidence of checking up on her (eg. if you’re on a social networking site that shows who visited your profile, don’t use it. Looking like you’re snooping on her will likely put more pressure on her).

And obviously don’t flirt with other girls or show signs that you’re shopping around. Be faithful like you’re still together.