Start over? or just forget it

Hello i play BL2 for a long time spend much hours also in my xbox account spend much money but last time.
i played with a friend he is new to xbox so we played offline splitscreen i never duped an item or cheated but he died like 2000times so i duped my lvl 9 infinity for him but now i feel bad about that it is offline but still shall i start over whit a new xbox account or not i really cant sleep xD

It doesn’t really matter what you do in your own game. You won’t get banned from Xbox.

This isn’t, however, an appropriate place to discuss this. Pm if you want further advice.