My husband 32 y/o male physician has befriended a 20 year old female med tech at work. They text almost everyday about a variety of things, some work related and a lot of it is personal hobby related and texting about their Strava. They go surfing together and often go to a Pilates class that some of their other coworkers will go to. There seems to be a friendly outside of work culture at his job, which is cool. I have also been invited to the hangs, I’ve gone to Pilates, but unfortunately they (my husband and this girl) are both fitness fiends and I am not on their level. Their texting is a sort of inside jokes and a lot of “you’ll do great” encouragement for their personal endeavors. The thing that bothered me the most was my husband started messaging her in all lower caps, which is apparently what she does. I found that off putting, why is he copying her? When I compare his texts with other coworkers for outside of work activities they are more logistical, planning meetings ups etc. But the texting he has with this girl is different, any little excuse to connect and sometimes they message all day about things; for example “what wet suit should I buy or “sometimes when I look over at you in Pilates and I try to get your attention to commiserate over the difficulty but you are so focused, I respect your dedication” He assures me he loves me and he sees her as a mentee (because she wants to do medicine) and on top of that she is talking to someone, so according to him that’s proof she’s not interested. He says she is his friend and that’s all there is to it. I honestly just feel like it’s blurring boundaries and it irritates me. Is this strange? Am I just being hyper vigilant?