My partner hates my best friend

This requires a bit of explanation. My best friend and I have been friends for about 8 years. We used to be attached at the hip and once I met my fiancé, her and I had a riff. She was very demanding of my time and attention and made me feel so guilty every time I was in a relationship. So after I moved in with him, my friend and I drifted apart. After about a year, her and I reconnected and have been trying to work on our friendship. My fiancé despises her because he feels like she was and is a threat to our relationship. I’ve given him a lot of reassurance and told him I was trying to create a healthier relationship with her. But every time I see her, he’s furious with me. He will ignore me for days after I see her. He claims that I love going out with her and dropping money on drinks etc, and that I drag my feet when I’m hanging out with him.. I obviously don’t see it this way. I love going out together with him and yet he is obsessed with comparing our relationship to my friendship with my friend. I don’t understand his comparisons and it’s become so frustrating for me. I only see her about twice a month and he thinks this is too much.. I feel so lost. I want to keep this friendship and I want to obviously keep my relationship as well…