you ' re attaching a lot of really extreme negative thoughts and emotions to this guy , that ' s something youcould try to stop and instead just communicate honestly to him that you want to end the relationship and move on because you ' ve met another guy . he might not really be as ' crushable ' as you think , and even if he is , it will be better to just communicate clearly your intentions and that ' s the only way to do it . People have such a hard time just communicating to each other and they turn it into some big horrible thing in their own imaginations and seethe with negativity over something , but you could just communicate to him and leave the relationship . all you owe him is sincerity and genuine communication , just explain to him you feel like you two would be better off in different relationships and you want to break up , you don ' t have to stay with him if you don ' t want to be with him , just communicate it to him clearly instead of cheating on him and leading him on and pretending you ' re being good to him or ' a friend ' by not really leaving him when really you ' re cheating on him and leaving him , because that will hurt more than it would to just clearly and concisely end the relationship .