How do I get my one year old to sleep through the night?

My baby hasn’t slept through the night ever. He did only maybe 4 times ever. He is breastfed and I think he honestly just wakes up from separation anxiety. My pediatrician said he is the 10% who doesn’t sleep through the night. Has anyone else dealt with this? My husband has no patience for him and says what is his problem?! Because he wakes up every 2 hours … he goes 3-4 if we are lucky. I tell him what is your problem he is our son. But a little advice on how to sleep train and maybe how you have been successful with one year olds who have never slept through the night. Rocking doesn’t help, he cries and cries… the only thing that helps and comforts him is nursing:/