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Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
When were you married?
I am afraid that it is not open to you to "send him Back"
If you end the marriage you can then report that fact to UK Visa and Immigration and they may revoke his Spouse Visa - and will certainly not extend it.
However first you will need to take the step of separating
Please ask if you need further details