My best friend was making out with my boyfriend. Am I overreacting?

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I genuinely don't know if I'm being dramatic or if this is as messed up as it feels.

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A few nights ago, I walked in on my boyfriend and my best friend making out. Not a "friendly drunk kiss," not a misunderstanding, full on making out like they forgot the rest of the world existed. The worst part? These are the two people I trusted most.

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My boyfriend immediately started apologizing and saying it "didn't mean anything." My best friend cried and said she made a mistake and doesn't want to lose our friendship. Apparently it was a one time thing, but honestly, I don't know what to believe anymore.

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What gets me is that if they cared about me, how did they both end up crossing that line in the first place?

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Would you ever forgive a best friend after this?

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I'm angry, hurt, embarrassed, and honestly questioning whether either of them ever respected me.

Need brutally honest opinions.

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