I farted and my boyfriend got mad!

My boyfriend (30) and I (28F) were cuddled in bed, under a blanket. Not doing anything, just cuddled up. Randomly, I farted, literally out of no where and he IMMEDIATELY jumped out of bed and said, “okay I’m done” and started getting dressed, saying, “stuff like this irks me”. I replied, “I understand, but that was completely unintentional but also very natural”. His response, angrily, “why would you fart in the bed, under the blanket?”. I just sat there, shocked, with absolutely no words! At that moment, my heart shattered into every tiny piece imaginable.

What should I do?