Basically you got 2 choices.
Let it drop or invite him outside (even if only metaphorically)
There must be something that you've done to wind this person up. People are very rarely snitches just for the sake of it.
I would suspect that this person perceives you aren't pulling your weight and, despite dropping several hints, perceives you have either not got the hints or have ignored them.
I'm not judging, just guessing based on the likely numbers.
There is a 3rd option.
Speak to this person in a calm and dignified manner, ask why they grassed you up and if it is as I say above, then apologise and make amends.
That person could be your superior one day and it never does to have antagonism in the workplace.