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i can help you for your concerns.
If you want to add your boyfriend in the contract then it would be completely new contract but if both parties are agreed then there is not an issue.
on the other side, if you want to end up your contract in August then still you can convey your message by writing to you letting agent that you want to end up in August. there are more than 2 months remaining so you would not have any problem.
i hope it will help you.
please you give 5 star to encourage me to help people.
if you not want to renew then you can give notice to leave the property on end date of tenancy.