How can I get the ring back from ex-fiance?

Anonymous
So, my fiance broke up with me about two weeks ago after finding out about a minor indiscretion of mine from a few months ago at a girls trip, I have no idea how he found out and no one will admit to telling him and he won't tell me how he found out.

Anyway a few weeks ago he comes home and just asks to see my engagement ring, he wants to check something on it, so I hand it over, and he puts it in his pocket and breaks up with me, says he knows I cheated with a stripper at the girls night (I just jerked the guy off, I didn't have sex with him or blow him), gives me a week to move out of his home.

I ask him for the ring back and he says no, I say it's mine it was a gift, he says no I dont' deserve it and I have no need for it, but I Want it to sell it because I need the money for a new place, do I have any legal right to get it back?

Yeah I know I shouldn't have done what I did but we could have worked through it he didn't want to so I don't want to hear that I just want to know how to get the ring back, it's worth a lot and I need that money as he paid the large portion of the bills.
Updates
+1 y
Can people just stop focusing on what I did and blowing it out of proportion, I just stroked him, there was no penetration, I was drunk while out on a girls weekend and some of my friends were egging me on (at least they were friends, someone obviously dobbed me in).

My focus here is on how to get back MY ring.
How can I get the ring back from ex-fiance?
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