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After a few years off dating, I'm seeing someone again. He's a fantastic partner, I really trust him entirely. 

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He recently moved in as the only guy with three of his female friends - all hot, single young women. One of them recently broke up with her boyfriend and leans on him for "boyfriend" tasks and emotional support, she asks him to put together her furniture and come home when she doesn't want to be alone. I've expressed my discomfort with this, explaining I don't think there is romantic intent but the emotional codependency makes me feel weird. He's also uncomfortable with her attention and is setting boundaries. 

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I just get so jealous. I know he only wants to be with me, I trust him to not do anything, so why can't I relax? I can't bring myself to visit his home, it stresses me out too much and is causing a serious issue. I find myself becoming passive aggressive when he mentions/texts/gets calls from them. I know my jealousy is inappropriate and I don't want to acknowledge it or ask him to modify his behavior because of it, but the emotion still seeps through and affects him. 

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Does anyone have suggestions for coping mechanisms with persistent jealousy? I feel awful. He's a wonderful partner and I don't want to lose this, and I refuse to ask him to change because of the issues I need to deal with.