My Friend is dating someone who took advantage of me - Do I tell her about him?

Okay, this is complicated, but I will try and convey the main bits; Around three years ago I was in a secret relationship with a guy, M. On one occasion during that relationship I was made to continue perform oral sex after saying that I no longer wanted to. He apologised, and I forgave him, and our relationship continued for another month or so, after which I was encouraged by my friend, L, to break it off with him - M had dated a friend before, and if she found out, she'd be really upset. Roughly a year later, we began having casual sexual encounters with one another - I would go to his house as a friend to play video games, but we both sort of knew what would happen. I got reattached, but I eventually found out he was chasing somebody else. Many years later I was told he was dating another friend secretly at the time, as opposed to chasing them. Fast forward to now, and my friend L has just begun a relationship with M. I have had a Boyfriend steadily now for the last year who I love very much, and when I told him about M and how we had been together, he told me that I had been used and raped. This seems strong but I agree what he did was wrong. I've never really told anyone apart from my Boyfriend the whole truth behind what happened - I told L at the time that we were only thinking of starting a relationship, and just liked each other. I'm now wondering should I have told L about what M was like, and his previous misdeeds? Should I trust her to make her own choices and let it go? I try not to speak to M now, and so I don't know if he's changed. Sorry for the very long post, but a reply would be greatly appreciated! Thanks for reading x

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