Is ghosting a sign of cheating?

So started talking to a girl, met her a few times she invited me round at midnight to sleep beside her, we used to chat hours on the phone to the point we both have slept whilst being on a phone call with eachother, then one day she just disappeared like literally, never responds to msgs but still posts, one of her posts was her with a girl mate out for lunch and the tagine said this is a proper date so I know its not aimed at me, as we have a nice restaurants out in the past, so yeah wonder if thats a dig at a new dating partner, I messaged her a final time saying im gonna delete her number and she instantly replied saying sorry and thats she's just been really busy, i told her im glad she's alive and she could've let me know that a few days ago but carry on and she didn't respond which is fine I have her excuse now, so I'll move on and see if she may or may not reach out, but still if she does reach out ill want answers, but as of now I can't trust her fully, when you go days talking to someone to nothing at all, seems really rude and out of character, I couldn't ever just ghost someone, id be blunt,

Is ghosting a sign of cheating?
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