How can I rekindle my boyfriend’s attraction to me again?

I know that he is not attracted to me anymore, by the way he lost interest in me and the comments he makes to me about my weight. He never gives me compliments anymore and hasn't for the last 3 years. He doesn't walk up behind me and wrap his arm around me and kiss my neck/whisper sweet things in my ear anymore! I dunno what I'm doing wrong?
How can I rekindle my boyfriend’s attraction to me again?
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