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If your spouse wants him to stay the there is little you can do. Your husband is a co-tenant/owner of the property and can allow a guest to remain. If and when you both decide to ask the boy to leave you will need to evict him. It appears that he has established residency in your home. He is effectively a month to month tenant without a rent obligation.
You could try to encourage him to leave by asking him to pay rent. This mught be more palatable to your husband.
You will need to follow the Maryland eviction process for a periodic tenanacy.
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Please be aware that my answer is not legal advice, it is merely information and no attorney client relationship has been formed. You should always contact a local attorney for legal advice.