Sleeping with my ex to protect his secret, what do I do?

There was this school lock in, and I kinda had to sleep with my ex, cuz he's afraid of being alone and sleeping in the same room with a bunch of people and generally has the fear of being exposed due to old trauma. We had slept in an empty classroom alone, a few people saw us and now they're all like making claims about what had happened that night, even though nothing actually happened. The problem is there's this other boy that really likes me and I kinda like him back, hearing of what happened made him feel like I'm not interested. If I choose to expose the reason why I had to sleep with my ex, I wouldn't be able to live with myself, but on the other hand there's this other guy that's like ready to do anything for me. I don't know what to do.
Sleeping with my ex to protect his secret, what do I do?
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