The 21st birthday debauchery is understandable. His ingratitude is not. Is this a one weekend event or is this part of a pattern and a bigger problem? Talk to him. APhi's advice is good. If he's grateful and apologizes, keep him at least until you turn 21. You know what they say about payback...
If he's grateful and apologizes, keep him at least until you turn 21. 
You know what they say about payback...
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