Very strange behavior in signifigant other? Help?

Childish behavior... Best described as a rebelious teenager. Suddenly doing things he wouldn't normally do - not cleaning up after self (he threw up today around 4:00pm and still has not cleaned it up), irratable, wont see reason when being talked to calmly, keeps saying he wont do stuff and continues to do it on and on (smoking in our car we are trying to sell, possibly smoking marijauna), has been extremely stubborn, extra lazy, very rarely... .if ever himself? Could he be addicted to marijauna and having withdrawals? Or maybe he has some kind of mental issue due to a rough childhood? I have tried to approach him about things... mainly tonight I tried to approach him about the vomit issue and he acted as if I was ridiculous to bring it up. I am very stressed and frustrated. Please help me, help him.. ? Thank you.
 
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