This is just my opinion based on past experiences.
First I think the guy was a wannabee poser without much honor.
I have never asked for a collar back because I gave it to her as a symbol of my ownership and her love for me. It would be like asking for a wedding ring back only a more important symbol then that.
I have been given back a collar or two and that was her choice part of her need to show her sense of anger and hurt. What should I do with it hang in on a wall as a symbol of failure, I don't think so. I make cuffs for any sub that has chosen to serve, they are hers made for her to be part of her. Once given I have no claim on them and would refuse to take them back.
Toys are hers in todays day and age of STDs I would never insult or endanger a new sub/slave with ones that have been in or on another. What kind of protector would I be to do that.
It may have been fun at one for the two of you but I agree that you are much better off with him. Find a real honorable honest Dom one that will respect you, honor you, have pride in you for giving your gift, and one that respects and treasures you.
Russell
the knight errant or errant knight I can't decide