My boyfriend ex has huge boobs while I have a medium size. Sometimes Im really insecure about it?

So all of his ex-es have a big chest (boobs) but I have like. A B cup and thats makes me insecure. He is a really gorgeous human and Im feeling like I am not enough for him because I am not such a beauty (even if he tells me that I am everyday without me asking for it). I am not perfect. I dont have that many curves and Im kinda skinny. Its just that everytime we talked about ex-es (and we dont talk that much about them ) he says " At least she had big boobs". And Im feeling Like I compare myself to them.
My boyfriend ex has huge boobs while I have a medium size. Sometimes Im really insecure about it?
Post Opinion