How can I convince her to go with me on this?

I caught my wife in an affair and the last few months have been pure hell. We both decided we love each other very much and want to stay together. I think I just need some time away from her to process my grief and feelings of betrayal. I want to spend June with my sister and her husband. My wife absolutely refuses to let me move in with my sister because she's afraid I'll sleep with my ex who has been hounding me ever since she got wind of the affair. She also said she needs me to be close to her so she can "make up" which means stick to me like glue 24/7. I don't think its fair for my wife to dictate to me what I can and cannot do when she's the one who caused all this pain and sorrow. Our counselor said he thought the idea was great and its not like we won't see each other at all for 30 days. We would still see each other on dates every weekend and our counseling session every Tues/Thurs we just won't be sleeping in the same house. How can I explain to her that I need this time to process and heal?