I really need to vent before I explode 😡

I really need to vent before I explode 😡

So about 6 years ago my fiancé used to mess around with this female and it was never serious. Now her cousin which is my fiances best friend had a baby with his sister & she's always around. She always makes a comment about my stomach and my pregnancy she already knew I was pregnant and told my fiancé congratulations after she seen my bump. I got so upset today and I told him either he tells her to mind her business or I will & he got all upset telling me I'm extra and I'm overreacting. I'm over her being all in my business & always looking me up and down. SB: she looks like peppa pig & has no body shape at all it grosses me out looking at her🤢🤢🤢🤢