How to stop loving someone?

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Ok, so my boyfriend, we'll call him "M", loves me and I have recently discovered I am in love with him. Actually IN love. And my friend, we'll call him "D", is cute. Now, here's the problem: Me and D are going to be shooting a movie together (small movie, we wrote the script). My character is supposed to have a crush on his, and his on mine. Now, we have discussed this together that it is ONLY acting, and anything that happens in the movie is for acting purposes only. But when we talked on the phone together (for like 2 hours, might I add) he replied "or will there?" to me saying "nothing is going to happen between us". And I laughed, thinking it was a joke, but he apparently didn't. In that phone conversation, he admitted to me that when he first saw me (he didn't know I had a boyfriend) he had a crush on me. And foolishly, I admitted the same to him. My boyfriend, M, loves me a ton. He gave me a beautiful braclet with my name on it, and he's a bit overprotective of me. But that just means he loves me. Right? Right. Anyways, his relative just died and he had to visit another country for the funeral. Now, I am NOT going to break up with him just to be with D. If I do, he'll be heartbroken for two reasons: his relative, and me. And the whole school will gossip about it. And that means chaos. Utter. Chaos. So, I'm trying to not like D. Any tips as to how I can do this? I see him almost every day at school, he's part of a small movie studio (group of friends studio) with me, and we talk on the phone a lot. I don't want to distance myself from him, that would make him feel weird and keep asking me "why are distancing yourself from me?".