Dodged a bullet I’d say! Would you want someone to tell you? I would and I don’t think it’s inviting drama, for you aren’t the one being deceitful. Truthful information is not a bad thing, just hard to be the one to deliver it. You may end up feeling empowered for stopping this jerk in his tracks. For what it’s worth, I think you should take the road less traveled, the hard road. You may save her some heartache, certainly not all the girls he’s going hurt, but helping one would be enough.