Any advice on helping a guy be comfortable opening up to you?

I am dating a man who loves me and I love him but we have one hurdle I am super open and vulnerable and he isn't. I have told him it's safe to open up to me and I haven't judged him for anything he has ever told me, but he is a vault to his true feelings and struggles. I don't want to give up on him but it feels like knocking on a bolted shut door. Any advice is appreciated.

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i want to add please be kind this isn't a place to vent your own issues with women.
Any advice on helping a guy be comfortable opening up to you?
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