I accidentally told a student I wanted to fuck them

I’m a fairly new teacher, I had one class that I was working as an assistant for. I had my own class this fall and one of my students from that class followed into my new class. I had a meeting with him where he told me he was moving to a different school, but wanted me to be his senior project advisor. I was so happy that he wanted me, I’m just out of college and this is my first year teaching. I was thinking to myself “fuck yeah I finally did something right” the student left and I said out loud “fuck yeah I finally did something right, I can’t wait to fuck—- them when they’re older”. What I didn’t realize was he hadn’t actually left. He was standing there almost in tears from embarrassment. He said he couldn’t work with me and almost ran out. Now he’s ignored every message I’ve sent him. I feel absolutely terrible and don’t know what to do. If I could go back in time I would in a heart beat. I just hope he doesn’t think I’m some sick pedophile.