Could break our friendship?

could either ruin or enhance your friendship. It all depends on what either or both of you demand in exchange for giving yourself to each other. Get it? You could have with him and still be the best of Friends. But if what is intended is exclusivity, then that's kind of a commitment. You should discuss it openly with him and then decide if you want to have or not, either as friends or as lovers. But you must discuss it ahead of having with him so that your friendship is kept. Adian.