I almost had an affair and I’m deeply scared to tell my female best friend because I’m scared she’ll think I’m a horrible person. Any advice?

I’m 20M. Last summer I almost had an affair with an older woman. We talked online, sexted for a while and agreed to meet up. She stopped messaging me before we could meet up and I never heard from her again. It only hit me afterwards how disgusting and selfish I was being. I was terrified because if she hadn’t stopped messaging me I would’ve genuinely gone through with it.

It’s been 8 months now and the guilt is still driving me insane. I haven’t talked to anyone about it. My best friend is a girl (19F) and I’ve been struggling being around her because I feel like I don’t deserve to have her as a friend anymore. She’s talked about how she hates creepy men and and hookup culture and thinks I’m a good friend because I’d “never be like that.” I can usually talk to her about everything that’s bothering me, but I’m this case I’m absolutely terrified to tell her what I did because I’m scared she’ll disown me as a friend.
I almost had an affair and I’m deeply scared to tell my female best friend because I’m scared she’ll think I’m a horrible person. Any advice?
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