<human>: So about 6 months ago I left a relationship that had been constantly on the rocks. I can admit my faults and say that I wasn't the best boyfriend to her at times but things really did change once I found out that she had been unfaithful to me. I tried to move on and accept it but later on I couldn't help myself and broke it off.  
  
Fast forward to the present day. I have maintained NC with her until now. I'm not at all resentful towards her. I want her to have a good life. I've been with my new girlfriend for the past 2 months and have been loving every second of it.  
  
However, I feel very bad that she's posting incriminating things about me on public forums that my friends are now reading. I've been feeling like sending her a message and apologizing but I'm honestly not sure what to do about this. The fact that SHE feels wronged is sort of eating away at me. I don't want to leave this whole thing with her having any bad vibes towards me.  
  
Do you guys advise sending her an apology message and leaving it alone from there? I feel like I was never really there for her and at the time I really should have been.

Can you give me a shortened version of the text?
<bot>: Should I message my ex from 6 months ago apologizing for how little I tried to keep the relationship alive and not ever really being there for her?