Being friends with your ex can be difficult. Even if you feel you've let go, your heart has a different opinion on the matter. I'm not a love expert, but I completely know the feeling you are having right now. Feelings of jealousy tugging at your heartstrings wondering whether your friendship outweighs the pain. There's no simple answer. If you end the friendship you will probably suffer a period of regret having lost that friendship. On the other hand, if you stay you could continue to constantly get feelings of jealousy and suffer. I hope it all works out for you. Reach a decision that will make YOU happy.