My dad caught me having sex with my bf?

I came to my dad's house for the weekend with my bf and I haven't seen my dad since I was 11 and I am now 17 and everything was going really well until my dad came home from the grocery store and he caught us having sex because I forgot to lock the door. My mom knows I'm sexually active but my dad didn't. My dad looked really angry and he soon went outside and drove off and he never showed up this morning, I feel horrible and I'm really worried about him. Please don't say if I can or can't have sex because I don't need you to tell me what's wrong and right. Anyways, I feel really bad what do I do now?