Idiots at college, help?

[Cassandra]

So I have a boyfriend who I got together with under dubious circumstances and I have no desire for some people at college to meet him. He got a Facebook account so we could message each other for free, an it has no profile pic and says we were in a relationship 3 months later than it started, and I'm his only friend on it.now these college idiots are questioning me,asking me questions prying and making fun of me on Facebook. I really don't care what they think an have other things to worry about. I also really don't want them to meet my boyfriend. What should I say or do to get them off my back?