Tell her that you need her to find a different TKD studio or you are not R and really stick to it and mean it. Be prepared for her to say no, but think of it this way- you know that she is somewhat interested in R so if she says "no" it is probably not the last that you will hear from her. If she continues to go to that TKD place, I can almost garruntee that she will not fully break if off with him. My husband told me the same thing when he was willing to work on the marriage. He would just avoid seeing the OW at their mutual work place. Supposedly this would be pretty easy for him to do. But this plans lasted one week. As soon as they got back around each other, his motivation to work on the marriage fell apart.