I'm 5'4 105lb. I know I should gain weight but I'm worried my boyfriend of 3 months won't still find me attractive?

Hummingbirdhope
He always compliments how attracted he is to me but I'm worried if I gain weight he won't find me attractive. My lowest was 85lb and now I'm 105ish. I know I should gain weight because I've been counting calories and maintaining on 1800 calories still, but I'm scared to tell him
I'm 5'4 105lb. I know I should gain weight but I'm worried my boyfriend of 3 months won't still find me attractive?
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