How small do I really need to be?

amenah
my boyfriend still thinks I'm too fat because of my weight. I'm not a skinny mini and never have been but I'm the perfect "8" shape. I'm 140 lbs and go to the gym everyday so I have a lot of lean muscle.

i wear a size 8 dress size and I'm 5'5. should I really try to be 115 lbs like he says. is it even possible. I have always taken pride in the fact that I'm one of the lucky few women who have perfect measurements for the hour glass. I'm afraid if I go that small I will loose all my shape.
Updates
+1 y
my measurement.. I have a 36 bust 26 waist line and 36 hips my but is 41"
Updates
+1 y
39" in around the thighs together

How small do I really need to be?
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