What kind of visa was he granted?
You can contact the home office and inform them that the relationship had broken down.
This would cause him significant problems when he comes to renew his visa.
I hope this answers your questions. If so, kindly rate the answer and provide feedback.
If you have any further questions, please do not hesitate to ask.
Yes. Especially if he currently has a spouse visa.
Unless he is already eligible for indefinite leave to remain.