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The most stupid and overused line you can say to someone. It means you are totally and completely head over heels for them. Like you would die for them and then come back to haunt them.
My crush said 'I burn for you' in a DM and I died inside from happiness.
My friend texted me 'I burn for you' after I helped him cheat on his girlfriend.
My mom said 'I burn for you' to my dad on their 50th anniversary and it was the worst thing ever.