TW; Abandonment, relationships
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So after a few months of getting along quite well with my ex gf, I thought we were both making quite a decent effort at becoming friends. 

We were both going to the same gig in Cardiff last Thursday by happence, and agreed to bring some items we had of each others to return. She did not bring those items, however I obliged in her request to return her items anyway, even after her asking if she could keep one or two ornaments of mine.

I thought this exchange went well and I proceeded to enjoy the gig, have not thought about it until today a week later, went to message her to see if she enjoyed the gig only to find I have now been blocked....

I am not in crisis but am feeling extremely sad and feel like beating myself up. She never ever stroke me as the type be so cowardly even when our breakup was at its highest emotionally charged moments. I'm already over the loss of her as a firend, but with the sadness and beating myself up over the exchange and her not holding up her end of the bargain, I feel like I've been taken for an absolute mug in trusting her not to hurt me, especially after I made the effort to return her stuff, so could use some positive thoughts from you guys!
 

Was considering going to the police later instead of trying to contact her directly and drag out any arguments, but kind of decided ultimately I'd  just rather burn my bridges, so just need some emotional support here :)