Most Helpful Guy
You just say 'it's over' ... the end.
You don't need to talk him into it, he doesn't need to agree. You just tell him and start moving on.
Most Helpful Girl
simple.. you sit him down and say this isn't working, I know your seeing someone else. If you wanted to be with that person you could of just said so.. but i will make it easier for you. We can call this quiet, i will go my way and you can be with who ever you want. Thats all you have to say. Try to remain calm and try not to yell.