Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: Okay, to make a long story short. 

I (22F) dated someone (M23) I've known my entire life, off on, for four years from 13 to 17, and he stuck around until I was 19 before I finally cut him off. I won't get into it, but he was emotionally, verbally, and sexually abusive and tried to rape me at one point. He's also a compulsive liar, and probably bipolar. 

When I was 20 (he is a year older), I found out via a mutual friend he became engaged to someone. I talked to my lifelong friend about whether or not I should tell this girl what he's like, but chose not to out of fear of retaliation. He knows where I live and is military and has lots of guns.  

&amp;#x200B;

Recently I discovered, that less than six months after their marriage, they separated (unclear if officially divorced), are not on speaking terms, and she is pregnant (also unclear if his). I have a lot of guilt if this girl ended up knocked and divorced with an unstable and abusive person's child she has to care for for the rest of her life, and wonder if I could have prevented it by saying something two years ago. 

&amp;#x200B;

My SO (a wonderful, wonderful human being nothing like my ex) and my friends assure me I was not the asshole because of my fear of him and PTSD and trauma from the abuse, but a girl I'm barely aquaintinces recently made a comment that if she had an abusive ex she would tell every girl he dated after to "protect them" and girls who don't do this are "anti-female" and don't support other women. 

So reddit, AITA?

not warning a girl about my abuser