I have been happily married for 14 years and we have a 4 yo daughter. My DH was my first (and only) boyfriend and we have always been very honest and open about our relationships, feelings, sex, etc. I am aware he had other girlfriends in the past as he is 4 years older and I was 18 when we met. He has also had other female friends. One of them continues to be his friend to this day and almost every year he goes away with her on a short holiday, a week or so, abroad. He went on holiday with her when I was very ill in the late stages of my pregnancy and then again shortly after our DD was born. He doesn't see her as often nowadays although he often travels for work, usually to other continents and for weeks as he works for a giant corporation, so there's no way really for me to know where he is. Since leaving my job as a teacher to dedicate myself to hobbies, volunteering and raising our DD, I have often thought that perhaps there's more than just friendship between my DH and this woman he has known since adolescence. He has reassured me it is nothing and that they always take separate rooms, etc but I don't know. She has never visited us despite our house being quite open and often receiving guests. Is it just me having too much time on my hands to overthink and catastrophise? AIBU to think something is going on.