He cheated. I need guidance please

2 years in and I walk in on him making out with a girl in his basement (he didn't think I slept over at his house that night). He froze and when I say froze I mean it. We both cried for a while and then I went to work. This was last weeek. Haven't seen him and I'm seeing him today to talk. I'm not sure what to do. I haven't eaten my stomach has been in knots for days and I'm not really sure about what I should do. I have a couple of questions written down about our future and all this and questions from that night but how do we come back from this. I am heartbroken I'm devastated and I don't know how we can repair this. Yes he just kissed someone else and yes it's a big deal but right away in my love filled brain I thought only about recovery. How do I start to recover from this. I can't even imagine myself kissing him ever again or not anytime soon. What do I do please help