Everytime she mentions her boyfriend i get angry / jealous

Basically there this girl i like (she is taken though) and she knows my feelings towards her. I talk to her everyday and i'm fine talking talking everyday, but whenever the topic of her boyfriend comes up, i can't bare to type / speak her boyfriends name and when i eventually do (i've agreed not to call her boyfriend "him" and other titles) i get overcome with anger / jealously / sadness (sometimes all 3 in one go) This also happens whenever she mentions his name, but ofc i don't show my reactions publicly What can i do to overcome this; i don't like feeling jealous etc. it doesn't suit me well

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