Did I accidentally cheat on her 😲?

We have been dating for a little over 6 months, there has never been a day where she didn't contact me, sometime She has been a little flaky as far as the response time, but we both work busy jobs so that's all good. Recently she went four days without contacting me at all, I live in a flake capital in the United States of America, where girls are extremely flaky and ghost regularly. So I figured she was just being non-dramatic and ghosting me, no big deal, it happens. So I called one of my regulars from before we for serious and I slept w her.

Then of course my girl inevitably calls me, and says she was busy because her sister was visiting. So was this cheating? Should she have texted me at least hello while her sister was here? I'm open to judgment. Let it rip.

Yes you're a cheater!
Nope, it was understandable
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Did I accidentally cheat on her 😲?
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