How do I tell my ex I can't sleep with him anymore?

Anonymous
My boyfriend and I are in college and we broke up a few days ago. We still had really strong feelings for each other but we mutually broke up because he had too much on his plate and as a result, he wasn't treating me very well. For the past two days he hasn't tried to sleep with me, but the two days before that, we had sex. I love him and I love sleeping with him, but because I know I shouldn't be with him, it's making it really hard to get over him. It's so hard to say goodbye to it, but I like someone else (we haven't even kissed, right now we're just friends) and I won't be able to open up to him and feel ready for another relationship if I'm still sleeping with my ex. How do I say it without being mean?
How do I tell my ex I can't sleep with him anymore?
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