Please help me

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I'm dealing with unbelievable guilt.
I've been in a relationship with the most amazing person I've ever met, for almost a year.
Her and I have been best friends for so long.
but, deep down I'm Bi-curious.

Earlier today, I wasn't really thinking, I Came across a tumblr of a cross dresser, and we started talking, then flirting.
Then the person sent me a pic of their ass.
I Snapped to my senses and this wave of horrific guilt came over me.
I'm comfortable with my sexuality, but I Feel as though I have Cheated.
I gave no name, mentioned no details, and sent no pictures of myself.

But what have I done, what the fuck have I done.
Am I overreacting?

I had a shower, calmed down, went to eat dinner, and nearly threw up.

I Can't tell her, it'd absolutely destroy her.
If I could return to this morning and change this I would.
I Feel like I'm in a nightmare.
Please help me.