I accidentally cheated on my boyfriend?

Anonymous
Okay, people will obviously judge me but please at least listen.

Basically I accidentally had sex with one of my boyfriend's guy friends while at a party. We kinda talked then he took me into a room and well I kinda got a little interested and we started having sex... Then my boyfriend came in and got very mad and broke up with me a few days ago.

I feel so upset, and I really want my boyfriend and let him understand that it was a freaking accident!!! But he won't talk to me, so what should I do?
I accidentally cheated on my boyfriend?
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