If you're filing in a community property state (Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington or Wisconsin) then when you file married filing separately you divide everything that each of you has on the tax return equally on form 8958 and the HSA and the 8889 will be divided equally.
If you're in a community property state and allocating your income that way then this link should help.
If you are in any other state then each of you enters the information from your own tax forms onto your own return and files that way. In which case the HSA just goes on his return and he marks that he has a family plan.
[Edited 04/2/24 12:34 PM PST]
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