How can I be more verbally expressive with my boyfriend?

My boyfriend yesterday told me that he feels I don’t love him as much as before because I don’t talk about my feelings lot. I really struggle at being verbally expressive or opening up! I suck at it. And it has nothing to so with him as a person.
Even worse we’re in a long distance relationship now.. so I know it’s important for us to have good communication. I’m just painfully shy. Scared that it’ll be a tirn off for him.. what should I do.
How can I be more verbally expressive with my boyfriend?
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