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Answer:
I think you can be respectful and kind, but there is no way to protect him from hurt. He will just have to get over it. Everyone has had their heart broken before and we always get over it and move on. Just tell him the truth and wish him the best of luck in the future.
Answer:
tell him. dont lead him on, but from the post i doubt you would. if you tell him hell be fine but dont wait and dont just go out with someone before you have told him, that would ruin him
Answer:
It may be cowardly but if it was me I would just avoid him. If he actually asks you out say that you are sorry but you already have a boyfriend.