that is tough girl, My advice would be just tell him and get it over with, thank of how much better you will feel afterwards and your right he would be more hurt if he ran into you guys somewhere or heard from someone else. If he truly cares about you and is a true friend he will understand and be happy for you, of course he may be bummed at first but maybe it will make him move on with his life
ps congrats on the new guy
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Proud Member of the Spoiled Rotten Club
and in the end, its not the years in your life that count but the life in your years.... Abraham Lincoln