My baby won't sleep without a boob...?

He was an easy baby since day one.. he nursed well and always slept through the night.now at 6 months old he has started waking up every few minutes til I give in and put him in bed with me. And even then he wakes up mad if he is not always next to my boob. He roots around all night. Im exhausted...I miss my easy baby! Lol