The more selfless thing you can do in this situation is be firm with your decision. We always focus on how to heal a broken heart after being dumped, but we never acknowledge how crappy it is to be the heartbreaker.
Being vague will only lead to them contacting you again, so cut it off cleanly. So ease up on your expectations. But remember that uncomfortable feelings and difficult experiences are all part of being a human. Megan soon realized why Buddhism has sustained for thousands of years, and she now brings the philosophy into the counseling room to help her clients change their relationship to their struggles and to themselves. Stay positive and you should avoid any awkward arguments. Karma or timely comparison experience?