Not your typical "She needs space" Question.?

Speaking as someone who's been in her position before, it sounds like she has pretty much decided to stay with her boyfriend, but she is stringing you along just in case. She wants you to be there if she decides she doesn't want him anymore for whatever reason. Maybe she is even considering leaving him for you, but she probably won't. She probably feels incredibly guilty for dating you while she was still with her boyfriend, and she feels she needs to make it up to him. You have to look at the facts, she's with him right now, not you, and that's all the information you need. If you decide to continue to pursue her, you need to be very understanding and let all of the decision making up to her (when you will talk, how often you will see each other, etc.) but also let her know you are indeed still interested, because she probably also thinks you're sick of dealing with her indecisiveness.