I'm at a loss about what to do..

I farted on my boyfriend of two weeks. Loudly.

His face was so shocked I could have died. I played it off like I meant to do it because I was so mortified.. he kept saying, "In my mind girls don't fart. You just shattered that defensive wall around my brain.. don't ever fart again, haha" At this point I'm still shrugging the whole thing off like it's no big deal. I feel horrible for lying to him but I was too embarrassed to admit that it slipped out. He joked about it for a good half hour and was back to normal after that.. he was still telling me how much he was going to miss me over fall break and how pretty I was, etc.

Should I tell him I farted on accident, not on purpose? I don't want him to think I would intentionally do that, which is exactly what he thinks at this point. But I'm a fairly prideful person so I'm hesitant to admit to him that the whole thing was an accident.

I'm completely and utterly embarrassed.