A copy paste Anyway try:-
1. Stage manage a cheating scene either you as the victim or him/her as the victim.
2. Be frank and say quit in a honorable manner
3. Get silent on him/her
4. Use sms/fb/mail
5. Do what s/he hates most
6. Last but not least, get his/her stand on the Proposed constitution and capitalize on it. Insist s/he joins ur faction or part ways. If s/he does then use that as a base of him not having principles and if s/he doesn't, then say you can't agree on many grave things coz you are incompatible.
punda amecheka