The shocking letter, which was posted by Arijit, 29, on his official Facebook page last night, also had the singer pleading to Salman to retain his song in the actor's upcoming film "Sultan".
The "Tum Hi Ho" hitmaker said he had to resort to a public platform because even after apologising to Salman personally, the 50-year-old actor didn't budge.
The reason behind Salman's alleged resentment is not known.
After deleting his long post, Arijit wrote, "Hope he gets my letter through someway. PS. This whole thing will backfire at me I know. Prayers.."
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"And I understood and I felt extremely sorry about it as me and my family have been your fan since long. I tried to explain so many times but you never got it. I apologised but you never got it. How many times I sent you apology texts, you also know (sic)," he further wrote.
"At Nita Ji's place I only came back to apologize to you but you dint get it. No problem I apologize here In front of everyone but please it is a request. Please do not remove the song that I sang for you in sultan... (sic)," the singer wrote.