How do you deal with retroactive jealousy?

Retroactive jealousy is when the current partner is feeling threatened or jealous over the partner’s past exes/relationships. I personally feel threatened by my bf’s most recent ex because she’s still in the picture (they work together). My boyfriend doesn’t give me a lot of reassurances, whenever I ask about his ex he would always talk about his other ex (not the most recent one). My insecurity is taking over and I just feel like he doesn’t even see his most recent ex as an actual “ex” because whenever we’re talking about the past he would always avoid talking about his last relationship…

I feel like I’m getting toxic but I’m having trouble dealing with this, any tips?

How do you deal with retroactive jealousy?
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