<human>: Could you distill the essence of the text into 1-3 sentences?

I'm going to try to keep this short. I met an older man and became his FWB for a full year. I wanted to be more, but he constantly gave me excuses ("I'm too busy", "I'm not ready"). I was confused because he took me on trips, spent holidays with me, took me to his home on weekends, introduced me to friends, kissed me and cuddled with me, called me "Beautiful", etc. Things that I thought were hallmarks of a relationship.

But all was revealed when a message intended for his girlfriend was sent to me instead. I don't know who she is, but I know 2 people who *may* pass on a message for me. What I'm wondering is: should I even bother? I don't want her to get hurt by this douchebag. She probably has no idea that he was screwing around on her. I'll be honest, I want him to hurt too for what he did to me, but this isn't about revenge. He doesn't deserve her, at all. The truth may come out eventually.... So, should I try to warn her, or leave things be?

**Important note**: he has a criminal record and hid it from me, so he's very likely to be hiding it from her too. He's anti-authority and a former drug dealer.
<bot>: My FWB had a girlfriend for who knows how long, and lied to both of us. She probably doesn't know about me. Should I try to warn her about what his cheating ways and criminal history?