Cut communication/ghosting?

Why would a guy cut all communication w a situationship ex (he was friends w before) but not a relationship ex?
Why would a guy go to such lengths w a situationship he was friends w 1st, but keep another ex around?
I say situationship ex bc yes it ways that’s still an ex, although not as technically correct as a relationship ex.
The situationship was 6 mths long, he called me his girlfriend and ILYs were exchanged. That being said, I knew it wasn’t a relationship. Actions and words never matched.
Why would a guy say ILY before he started avoiding and ultimately ghosted a girl? Obviously I know it’s bc he didn’t love me, I wanna know why he’d do that?
Cut communication/ghosting?
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