Will she talk to me again or allow me back in her life?

I'm a 26 yr old male, been dating this girl for 5+ years (she will be 25 in a week). Anyway, she's been talking to this rich(50 - 60 y.o.) attorney who has been financially supporting her for three years throughout the course of our relationship. She doesn't work and According to her and her friends gold digging is a job. I recently found out from screenshots on her computer that they have been having "weekly sex sessions." When i confronted her about it she stated they never had intercourse because he has erectile dysfunction and all this other fluff that i feel could have been true? I'm not sure. he had no idea I was dating her so i contacted him and exposed her because i wanted to know the truth. He said they have been sexually active. Some people are telling me thats him lying to push me away? I don't know who to believe or what to do. I invested a lot of time and energy into her and do love her, but she changed her number and its like she vanished. She never used me for money. Ultimately i'm hurt, distraught, sad. people are saying i should have never contacted him, but i feel like it was the right thing to do. How do i justify what i did to her? she's a bit of a narcissist.

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