Search Results: no response from him

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.

TLDR; girl I was talking to online removed me for no reason, and I don't know why she did it

I met a girl online on this app, on Wednesday. She had commented on a question I had asked once in my local language, and I immediate realized her to be from the same country I was, so we took it to the DMs and hit it off. She gave me her Snapchat and told me she'll be talking to me from there from now on as she was deactivating her G@G account, so we exchanged IDs.

We were mostly just talking and casual flirting, and her responses to all my advances were very positive. She was much more talkative than I was and it genuinely felt like she was actually interested in me and that things may go somewhere if all goes well. I learned that we had a lot in common and that she also lived in my city, just a couple minutes away from where I live.

We'd mostly talk at night because she'd said she had a night job and she'd get free by 12AM. I was mostly awake during the time and I have work to do of my own, so it was fine by me. Last night, I hopped on Snapchat as usual and I saw she had seen my snap but not responded to it. Then I clicked our chat open and saw that she had removed me as a friend.

I really don't understand what happened and why she'd do something like this for no reason. On the night before yesterday, everything was going so smoothly. We talked till 3:30 and we wished each other a good night and went to bed, so this doesn't make any sense why she'd do something like that. Am I missing something? I would appreciate every single helpful response under here.