Most Helpful Girl
You've got two "issues" to think about:
1: Do you see a future together with your girlfriend now, or do you think you'll break up again quite "soon"?
2: Are you into the new girl? Because if she's just into you and you're not that into her, you're just looking for a replacement of the attention and love you're getting from your current girlfriend.
If you want to make your relationship work, I suggest you just let the new girl do whatever, but don't let it stop you from befriending her, and maybe down the long run (or short run) you'll develop feelings for her which make you sure about your choice.
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