Would you consider this cheating?

So I was on the phone with my friend, and she said "Hey, you should make a fake kik account and message my boyfriend." For anyone who doesn't know, Kik is a messaging app. So I made a fake account and my friend said "Message my boyfriend and tell him that he's cute." My friend has been having trust issues lately, so I wasn't thinking and just did it. Then I waa joking around and said "I wonder what my ex would say if he saw this account. " so I messaged my ex saying the same thing.
I didn't do this for that long, I eventually just deleted the fake account since I'll never use it again. After awhie I begin to feel weird.. like I had cheated on my boyfriend. I started crying a bit, and my friend on the phone was saying "No no, it's okay. You didn't mean any of that and it was just a prank" but I still feel weird honestly.
I wouldn't do something like that again, but would you consider that cheating? It was a prank and I went under a completely different name and picture just to see the reaction. I was confusing my ex and wasn't even making sense.