Baby won't sleep without me!!

My son used to be a perfect sleeper. But somewhere around 4-6 months he completely changed. He won't sleep unless he is snuggled up to me. He'll even lift up his head and peek to make sure I'm still there and didn't swap myself out with a pillow 😂 how can I break this habit? I miss my husband lol. Also he's 100% breastfed and nurses 3-4x a night