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My first ever boyfriend broke up with me a few months after we started dating. I avoided him because it hurt me a lot to see him. He got very immature and rude and began calling me vile names to my face and making me feel like dirt. Needless to say, it was very dirty.
That was four years ago. He hasn't been in any of my classes until now.
He's in my science class and he's recently become friends with a girl at my table who is also my friend. He comes over to the table to flirt with her. Funny...he talks to everyone at my table except me and always ignores me.
I don't want him to tell his girl any untrue stories about me to make her dislike me. I think he's trying to make me feel bad and I have to say it's working. He made me have zero self-esteem and now he's rubbing it in.
I haven't talked to him in years and he turned around and walked away when he asked this other girl a question and she asked me to answer it. He obviously is still holding grudges and won't let it go.
I don't really want to resort to talking to him. Is there anything I can do to stop this behavior besides talking to him?

My ex-boyfriend was such a total playboy and when we broke up, I didn't want to seem like I was just trying to get back at him but I also kinda felt like it was my duty to at least give a little warning to other girls he was flirting with. The thing is, if you aren't friends with those girls then it just seems like your jealous. But since you are, I think you should just tell her very briefly the truth about what he did to you and let her make the opinion herself. If she is thinking about going out with him, then she has the right to know what he's like.

As for him, I agree that you should pull him aside and tell him to knock it off. If this is too tramatic for you to do, then just try to ignore it however hard it is and just concentrating on telling your friend about him. Don't exaggerate at all and tell her that you don't care if she still likes him and stuff but that you feel like you need to tell her this so she knows the whole story and more about him.

I've bolded the area that I'd like to contest.

I don't think that there is any evidence in her post to advance that claim at all. He may be a complete a*****e, but that doesn't imply that your statement is true.

If she were to say something like that to the girl at her table she would be slandering his name, and therefore lower herself to his level, which would show a definitive lack of maturity on her part. She could warn the girl that when the relationship ends he won't be friendly or kind at all, but that's as far as she could go, based on the information provided in the post.