I need advice :(

I love my partner. Incredibly. And I know he loves me a shit load too. 
But lately I've been wanting to sleep with some other guy, who's a friend of ours. 
He and I would talk years ago about that sort of thing, but we stopped talking when I got with my fiancée. Now that we're all talking again, I have this want to have sex with him. 
I know I never ever will, but I want these thoughts to go away.
Any ideas how to do this???

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