Is it fair my boyfriend won’t let me put stuff in his storage unit unless I pay?

So a few months ago my boyfriend said he was going to rent a storage unit to store some things, and asked if I wanted to go in on it with him and split the cost, and I declined as I didn’t have a need.

well I asked him the other day if I can store some stuff there because he has the space, and he said only if I chip in towards the rent.

it’s literally costing him the exact same whether I chip in or not so do you think he’s being unreasonable?
Is it fair my boyfriend won’t let me put stuff in his storage unit unless I pay?
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