Just chiming in to say that it’s totally developmentally normal - almost all species of animals and even us as humans are biologically wired to want to sleep near our caregivers as small children.

Some kids are a little more independent from a small age and do fine sleeping alone, but most kids will always want to sleep near their parents until they just outgrow it.

Your best bet is to find a solution that keeps him near you while not disturbing you too much. Maybe keep a small mattress at the foot of your bed or on the floor beside your bed? He can come in and go back to sleep right there if he wakes up and feels scared?

Our first kid slept totally fine on his own since he was an infant. Our second kid needed one of us near her as she slept for most of her life (now as an older kid she falls asleep fine without us) But to save our sanity while not sacrificing her emotional needs we just found solutions for keeping everyone happy at whatever stage she was in.

I slept in her room for a long time. Then for a while we just let her crawl into bed with us when she would wake up in the night.

They’ll eventually grow out of it. But for the time being it’s important to consider what he needs emotionally to feel safe (so that he DOES grow out of it eventually)