Girls, How do you deal with finding out you're the other guy?

I found out im the other guy. We've been dating for 3 years. I found out she's been engaged for 2 years. It hurts like hell. How do I heal from this. Im very angry at her for lying to me. I'm really starting to hate women now. I'm really starting to think about treating women like crap the rest of my life. What do I do?

Girls, How do you deal with finding out you're the other guy?
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