It doesn’t matter. Any conversation in which you tell a partner how evolution has built you not to be attracted to them will be offensive, even if they’ve said they value honesty. It could be that she’s too fat, or it could be that her elbows aren’t creased enough, or it could be that she sets her salad fork on the inside instead of the outside. It just isn’t the breakup conversation to have.
It doesn’t matter. Any conversation in which you tell a partner how evolution has built you not to be attracted to them will be offensive, even if they’ve said they value honesty. It could be that she’s too fat, or it could be that her elbows aren’t creased enough, or it could be that she sets her salad fork on the inside instead of the outside. It just isn’t the breakup conversation to have.