"Hey baby, funny story. Well, during the break I slept with someone else. I didn’t mean it, and I was thinking of you the whole time. So, do you want to get dinner now?"
So the honeymoon phase is over and you’re faced with a looming problem. You were cheated on by your significant other. You feel hurt and violated and you probably want to grab the closest blunt object. First of all, relax because you probably don’t want that third strike, and think about your situation. What do you want to do? Do you still want to be with that person?
If you were cheated on then you have certain things to think about, like how much you can get out of the cheater from guilt. Though they may be sorry for what happened, they do have things to make up to you, especially if they intend on making it work with you for the long haul. The trust within the relationship has been lost and needs to be rebuilt from the ground up. This all also depends on if the both parties agree to continue on with the relationship. If you feel that you cannot be with that person since they have done you so wrong, then you already know the relationship will go nowhere. So don’t kid yourself and think you can try to make it work because you think you are really in love with them. If you are always going to hang it over their head in the future, then you might as well just end the relationship now.
If you’re the one who cheated on your significant other, then it’s best that you both sit down and find out why it happened in the first place. The only excuse I can think of is that you were walking and fell on top of her. That might be a plausible excuse for certain people, but more likely than not you’re going to be out of luck. If you want to continue the relationship, you have to get across the fact that you made a mistake and that you want to make it right. The rest, unfortunately, is up to your partner.
My opinion is that you shouldn’t put yourself in that situation to begin with.