Bought a gift that can't be returned and we break up... what should I do?

My boyfriend and I had a bad fight. It is unsure if we are getting back together. Since I do want to get back together with him, I have to figure out what I can do. But the reason why I am here is because a week ago I set up something to get engraved (our fave line from our fave movie - nightmare before Christmas - on a glass heart with jack and sally). I already paid for it. What should I do when the engraving is done? Should I send him his heart and explain what happened (I paid - we broke up but I still think you should have this) or should I just keep it?
Bought a gift that can't be returned and we break up... what should I do?
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