I made-out with my sister's fiance (both of us were drunk), to tell or not?

It was held at a friend's party nearly 2 weeks ago and I've been trying to move on from it but can't. Maybe if it was just a boyfriend I might be able to let it go but they're gonna get married on Nov of this year.

We made-out that day and it was me that stopped it from leading to more. I stopped it some time after he unbuttomed my shirt and it was gonna lead to more.

I made-out with my sister's fiance (both of us were drunk), to tell or not?
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