Slept with my bestie's friend.....

Yesterday I slept with my bestie's friend and don't really know how to tell him I don't want anything more. They are both Marines, and we went on a double date yesterday. He was super nice (too nice, the girls don't date nice guys is kinds true) and I would love to continue being just friends.

Let's just say I've never wanted a rabbit as a pet, and I sure don't want one in bed....

I can't just ghost the poor boy, what do I do??????????