Newbie Wholesale Question

[Sierra Potts]

I have been wanting to get into wholesaling. After looking into it with many youtube videos, etc. I feel like I have a pretty good grasp on the process but one thing is confusing. So lets say I find a motivated seller and a cash buyer. I have the seller's home under contract and the purchase and sale agreement signed. When I present it to the cash buyer, what is stopping them from contacting the seller directly and cutting me out of the deal as the middle man?? Is there anything I can put in place to protect myself from that? Also, is it un ethical to not give the cash buyer the name of the seller or other information to prevent this from happening? 

Any responses appreciated. Have not done any deals yet but still working on the learning process and want to begin very soon. 

Thanks!