Let me be very frank with you, friend, you shouldn't have had such a close relationship with your current boyfriend. Secondly, when he became teary-eyed or was crying, you should not have said that you were joking because you were NOT joking, right? When you started dating or became closer, you could have told him that you were taking part in this, but you were by no means ready to have any serious relationship with him. I am sorry, but this is kind of hurting someone purposely. Enough of advising and all, let me tell you, he too can not be possessive with you at all, matters not if he's teary-eyed, hurt or is even crying. Don't change the topic because this is something serious. Talk to him properly, confront him. Make sure that you care for him, but don't forget you too have your own life and nothing can be one-sided. If it is one-sided, you won't be happy even if you marry. Tell him, that any relationship does not mean marriage. Every relationship does not need to bear a serious fruit. And you have every rights to mix with your male best friend. Be firm, not very strict. Were you asking about not hurting him too? Okay, honestly, you should have thought of that before you became closer with him. But I am quite sure these will help you. Listen to him carefully what he says. Tell him, that maybe he was compassionate with this relationship, but you both have lives, and maybe he loves you too. But then, this will be one-sided if you marry, so the instead of both your lives getting spoiled, you can be only friends if you want. But you don't want to get in anythng serious.