<human>: Can you give me a shortened version of the text?

Hello, 

So to keep this brief I split up with my ex in September. We'd had problems and I found out she'd cheated for a second time. She instantly began a new relationship and for the first month we attempted friendship. 

That idea crashed when she found I had begun dating (irony I know). She flipped, saying I was bothering her all the time and proceeded to block me on Facebook/Instagram/Skype. Before this she had asked me to replace a blanket I'd stained with ink. I did so. 

In return she agreed to send back some shirts (we were long distance England via US). There was also a locket that belonged to my late mother. She knows the significance and initially claimed she had mailed it. I later learn she lied to and I quote: "Just shut you up." 

It's two months, we haven't spoke and she hasn't sent it. I'm caught in a difficult position. 

1) I don't want to give her the satisfaction of thinking I'm trying to initiate contact because I know she'll spin that into "He called..." with our mutual friends. 

2.) I do have her parents on Facebook but I don't want to involve them at all. 

3.) I really want the personal item back. 

4.) More curiosity, but any idea why she is doing this? She maintains she broke it off, she's found 'the one' and is happy. I'm weirdly glad she's happy, but can't fathom why she'd hold on to my stuff like that.
<bot>: Ex is being a big meanie. Won't send very precious item back and has broken all contact. Debating how to handle it.