Story Time!! (16+) (also bring your popcorn)

Ok, so, there's this guy that has been into me for the past 2 years, but I'm not interested. He just is wayy too flirty. So, one day he sends me a dick pic, and has the caption: "Foot Long."

So, I start gagging because like, first off: penises are vainy and nasty. Second: You don't do that! So, I block him (duh), but he goes to my school! So the past week I've been avoiding him and school. But, as him being a shit face, he said to his friends I gave him a hand job, and it has been past out to the school, but my friends didn't believe it because they know I hate him. What do I do???