0816 a white lie

Tim and I had a conversation last night.Our dialogues were as below.
He:What was your weight when you graduated from college?
Me:About 55 kilograms.When I met my fiance three years ago, I was about 52 kilograms.Within one year,I had gained lots of weight from 52 kilograms to 62 kilogarms.
He:What's your weight now?
Me:63 kilograms.
He:No way!It is impossible!You are 63 kilograms!
Me:Yes.
He:My wife must lie to me.She says she is 55 kilograms.If you are 63 kilograms,my wife is no way 55 kilograms.
Me:Don't you know her weight?
He:She never let me see the scale.She must lie to me...