Why does my fiancé act different around my friends?

Anonymous
So I need advice on this, I know my fiancé is loyal and would never get with my friends but I just don’t trust him not that I’m (insecure) but I dealt with relationships where my exes would pretend to dislike my friends then get with them the minute we broke up It has happened many many times before and I feel like I’m going through this same manipulation scheme, It started off with my old bestfriend that I introduced him to when me and him first met I noticed a difference in his attitude he would purposely speed in the car when she was inside but never did that with (me) and he knows I hate when he speeds and kept doing it only when she was around, another thing he would act very energetic and excited everytime I was around my friends… and change of personality but once they leave he changes up his attitude, he would be more talkative around them but silent around me, and he only did this with the ones that he “ knew “ liked him… he would say things to me that he thinks my friends have a crush on him but seemed to me like he enabled their behavior more because he didn’t correct it until it was too late, the girl he kept doing this behavior with she ended up trying to hug him and kiss him and he did confront her about it, but to me It seem like he enjoyed the attention he was getting from my friends… more than he was getting from me. he doesn’t act like this anymore though after he realized how my friends were treating him he realized It had something to do with “ him “ and he doesn’t really show off much anymore, I recently met a new friend and I noticed he was trying to act excited around her to and I feel like he secretly tries to make me jealous cause he is quick to say these women like him when in reality It’s him doing things to give them that (impression) that he wants them , and when he’s around his friends I don’t ever act like this or change up my personality…
Why does my fiancé act different around my friends?
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