Boyfriend has notifications turned off and it bothers me how do I get him to turn them on?

We've been together about six months and in that time I noticed he has notifications turned off for social media and to me that is suspicous like he is hiding something but when I asked him about it he said he finds it annoying to have them going off and this way he is not bothered by them and he only checks social media when he wants and I said "what if I need to send you an important message?" and he said to SMS him, I said that may not always be an option and he said "it doesn't matter he's always had notificaitons turned off and it's not changing" and I'm just wondering if maybe he's hiding something, I don't even know his PIN yet what do you think?

Boyfriend has notifications turned off and it bothers me how do I get him to turn them on?
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