I doubt he has changed all that much since you met him. It is probably more that YOU are growing up, and so your perceptions of him are changing. It is common for people in your age range to outgrow each other.

I don't know that this can be fixed. It would be cruel to criticize his physique or his basic personality traits because those things are pretty much inherent. If he isn't a match for you, then consider that you both deserve to be with someone who values you entirely because routinely withholding affection is damaging to the soul.

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