How do I make it up to her?

I've been talking to this girl for 5 months I asked her out and she declined but we still are somewhat sexual towards one another I asked her if it was OK that I be intimate with other women because we aren't together and she said it was fine fast forward I send her a picture of me and she starts questioning who the girl in the photo is and I brushed the question off at first (my mistake) but the next day I told her the truth now she is pissed off at me. She told me to give her space, and I did. Then she was upset I gave her space, so I again tried talking to her, but she still seemed upset.
How do I make it up to her?
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