WHAT DO YOU THINK?

Soo... We bought Jake's horse for Christmas and she is pretty good but for a few things.  Anyhow when I bought her the guy told me she was 20, exactly what I was looking for, for Jake.  Long story short she is older than that.  Longer story, she and Caleb's mare DO NOT get along AT ALL.  So we talked it over w/ Jake and promised to replace her and he agreed that it is unsafe to have them both in the trailer for any given period of time, one or both of them would get hurt, let alone having any other horses in there, recipe for disaster so we decided to sell  her and get him a gelding.  I posted an ad on CL stating the pertinent info and since I'm not going to lie I named him by name as having sold her to me and the age discrepancy.  He is mad to say the least.  He called me wanting to buy her back saying I was slamming him on CL and why?  I said you lied plain and simple and I backed it up.  He immediately calmed down after I caught him in another lie, many actually. But I agreed to remove the ad if he makes it right and buys her back.  So, what would you do?  Was I wrong to call him out by name?  It is a small town and I've had lots of hits on the ad.  Would you sell her back to him or to someone else figuring that he will possibly do the same thing to someone else, which by the way is why I posted the ad that way, to prevent anyone else from getting taken... R says I should forgive, which I don't feel angry, I just don't necessarily trust him.  Is that unforgiving?  R says I should just sell her back to  him and he'll be responsible for his own actions.  ARGHHH!!! R says I worry too much.