To unclaim you, your boyfriend will have to "amend" his return removing you as a dependent.
You will not be able to e-file as a stand-alone person until his amended return is processed, which could be 12-16 weeks. However, you can still print and mail return, especially if he has already mailed his amended return.
You may or may not be required to file, but it is common to file even if you don't have to in order to reclaim the tax that was withheld from your paycheck.
Note that your boyfriend should check the status of his return, because it may have been rejected (this could explain the lack of refund).
How to check e-file status - https://ttlc.intuit.com/replies/3319882
To check the status of your federal tax refund, go to Where's My Refund? at IRS.gov.
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