My boyfriend is meeting my friend today

Hi everyone, this story is going to seem a bit mental probably. My boyfriend is meeting my best friend tonight. I'm really worried because I know that they are aesthetically eachothers types, but they also have so much in common, maybe even more than me and my partner have in common. I've had bad expierences in the past where my ex commented on how attractive my friends were etc and also had a different relationship where my ex and best friend slept together. The closer it gets the more paranoid that I am they are almost going to get along TOO well and my boyfriend will find me less interesting or less attractive. I know this is such an ugly insecurity but I'm making myself so anxious I almost don't want to go now Can anyone help calm my nerves or understand where I'm coming from?