My boyfriend is afraid of arguing?

he grew up with a lot of arguing in his home, and when it comes to disagreements or times where he feels there might be, he shuts down or filters himself. he won't express himself, if i do something that pissed him off or if i annoy him or something is wrong he will not tell me to avoid arugments and if i have a problem he gets scared and shuts down and or distances himself a lot. i grew up where expressing was a needed thing, I don't know what to do
My boyfriend is afraid of arguing?
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