I cheated in a relationship
That's very bad. Do you think your current partner will forgive you?
I don't want to know.
I think you should tell your partner about the cheating, because they deserve to know. You need to be honest with one another in a relationship, and discuss the problems that you're having. If you don't tell them and they find out another when then they're going to be very upset.
It's alright I guess.
That's a good first step. Acknowledging that you have made a mistake will make them less likely to be angry compared to you justifying your actions. Try to assure your partner that you will never cheat again and you will now be loyal moving forward.