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Under EU laws your spouse or registered partner would be able to travel to the UK with you. However, as you do not fall in that category, you would not be able to apply under EU laws for him to join you.
The only other option would be for him to apply to join you on a fiance visa under normal UK laws. A Fiancée prospective civil partner visa application is made by a person who is engaged to be married to or to enter into a civil partnership with a person settled in the UK. This allows the person to travel to the UK on a 6 month visa to get married. Upon entering the UK he would have 6 months within which to marry. After getting married, he would need to submit his application for a spouse visa.
Here is the guidance on how to go about applying:
Can I clarify anything for you?
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