To me it sounds like a guy is trying to keep their friend from getting hurt.
"I'll smile for you now cause you're sad and I'm not allowed to be sad" It's like he's trying to cheer up the sad friend and just be there for them.
"I'll burn for you now cause you're mine and you're not allowed to feel nothing" Here it seems like sad friend may have accidently broke the law or something and the happy friend takes the punishment for the sad friend.
To me it sounds like a guy is trying to keep their friend from getting hurt.
"I'll smile for you now cause you're sad and I'm not allowed to be sad" It's like he's trying to cheer up the sad friend and just be there for them.
"I'll burn for you now cause you're mine and you're not allowed to feel nothing" Here it seems like sad friend may have accidently broke the law or something and the happy friend takes the punishment for the sad friend.
That's what it sounds like to me.