Why couldn't I stop laughing?

Anonymous
we were watching just go with it and my boyfriend tells me he may not want to take me to the movies if I laughed this loud (he was joking of course) but I took it badly and started to cover my mouth and giggled inside a little... the held in laughs started to hurt and I started crying so bad... and I kept thinking how he said he hated people who did that and I thought he hated me for that and I felt so sad... when I didn't talk to him for a while he got worried... I pushed him away and he tried tickling me. didn't work... he saw what I was doing and told me to laugh out loud if I wanted and I couldn't stop! I was still crying in between breaths and he said he was sorry a lot that he didn't mean it that way and was sorry... I couldn't stop laughing though... my mom told me to shut up and I had to cry/laugh in my room for a couple minutes before I stopped laughing. I still let out small giggles at weird moments... why couldn't I stop laughing... is there a special condition or syndrome for this?
Why couldn't I stop laughing?
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