We have been married 8 years, overall a good marriage (second for both of us). This question post is quite tame and almost silly, but I'm becoming curious of when and if I should be concerned. My wife is gorgeous, bold and outgoing and by her own admission a bit of an odd duck. She recently started a long-term yoga certification training in the city close to where we live. This is a class where she spends two full days (weekends) approximately twice a month. In addition, the class is asked to attend yoga classes taught by the same instructor and others as part of the certification. There is one single man in the group, and I noticed his name coming up more and more in her discussions with me. When I was traveling out of state, she mentioned she was going to dinner to a friend's house in the class and she quickly added that this was a female friend. I'm not a jealous type, so it was kind of an odd clarification for her to make. Later, she added that the male friend was coming to the dinner also. In addition to the required all day classes, she started attending yoga classes 4-5 times a week. We do not lock our phones from each other and my curiosity got the best of me so I checked her texts. There were a few between them; him hoping they could have many more coffees together after class which she gave a 'heart' reply. It has become apparent that they attend the same classes many days during the week and from the credit card bills I can see that she goes to the coffee house almost every time after class (which is unusual for her to go out for coffee drinks that often). The texts were not flirty, but he would ask if she was attending different activities that he was going to. One was a holiday party that they both went to, another was a special session that she changed movie plans we had with the family so that she could attend after he asked her if she was going. She was showing me FB pictures of the class, and I noticed a few pics and videos that showed the two of them were working closely together, but since it is a small class that would not be unexpected. She also knows a lot about him, his background and life. She told me she was worried he was losing too much weight and getting too skinny because of his diet, etc. She recently asked if I would be ok if she spent a full weekend retreat (two nights) that the instructor was holding for about 7 members of the class at a resort over New Years eve/day. I supported her and she quickly signed up. I do not know if he is attending. We are hosting a small holiday party at our place for her class and he will be coming. This will be a chance to observe them together and see how he reacts to me. What should I watch for? Should I be concerned based on what I have shared?