That’s rather selfish. There is harm, but not to you. You’re okay with hurting other people for your own gain to avoid having one difficult conversation. I can only assume that you wouldn’t feel good if a partner treated you like that, so why do so to them? Either you have a general lack of empathy, lack introspective ability, or are just perfectly okay with the idea of being cheated on, and also the idea of someone else hurting because of your own actions. I’m fascinated, and also recommend you try consensual polyamory next time instead.