Hi Jules89, I have been on both sides of retroactive jealously. I have had it flare up when hearing stories about my partner's ex’s and I have also had a past partner who was consumed by it with me and her past partners as well. For me I had been single for awhile when I started seeking OCD treatment so when the reactive jealousy started to kick in, I recognized it as part of my ROCD and treated it like other intrusive thoughts and didn’t pay attention to it so as not to give it my focus and give it more power over my thoughts. Before I knew it was OCD however, it was much harder to deal with. What helps me is to remember that the past is the past and my partner is with me now…no amount of dwelling/anxiety towards the past will change whom they were with before. I also try to remember that my past is not exactly stellar and how would I feel if they were Uber jealous of my past and resented me or acted differently towards me because of it…so why should I make them feel that way. Most of all I remind myself that I have a lot of intrusive thoughts because by my OCD, but they are not who I am, and I don not have to act or be a certain way because of them. Stay strong and best wishes.