[Equinox]

Just a quick update, I consoled her about this. However, when I asked her about it, she merely stopped responding.

[Oni]

Just a quick update, I consoled her about this. However, when I asked her about it, she merely stopped responding.

I would just move on. If she isn't answering, it should be obvious. Dump her, move on. There is no way you would be in the wrong.

[cr33pyguy]

Just a quick update, I consoled her about this. However, when I asked her about it, she merely stopped responding.

So she stopped talking to you totally, or is just being quiet about the topic - if latter, just move on. If she completely stopped, are you sure she has seen the messages - if yes, move on. Elif she might have not seen the messages try until you're completely sure she has seen them.

[Mom]

I would assume the worst because there are some people who don't mature as quickly as others, making the same mistakes as before.
When we were children, when we didn't want to hear something we would cover our ears. When we didn't want to say something, we often didn't bother lying, we simply covered our mouths.

Your girlfriend is doing the covering her mouth actions via internets from what I'm reading, so again:
Saying she cheated is in the ballpark.