Push and pull.
Texting sucks major a** it is boring and annoying. By keeping yourself busy you don't prioritize texting and naturally will be more sporadic in your responses. Keep the girl walking the tight rope, but I don't think it is something you should do with a devout intention. Your natural state should put her in that state of uncertainty all on its own.
I didn't see the context of you not responding, but if she is upset she is literally saying "I want your attention and I didn't get it"! It is arguably a good thing!
Most women nowadays (and men) are insecure. We live in an era where people expect instant gratification and immediate responses. It is absurd to prioritize a blip on a phone when you actually have a life to live and things to do, but people still get upset because they feel entitled to a response. Every girl is different and only you can make a judgment call. I abhor anyone who promotes formulas or rules with texting, you need to play it by ear and understand nuance. Trust your gut above all else. Some girls want you to text them,
just don't overdo it. Some like when you leave them on read and more or less ignore them. Each girl is different just as each Man is different.
Example: I was talking with a girl over the summer who was ungodly shy and anxious. She would take hours to respond and always had a forced unnatural response over text to who she was in person. I thought she had low interest. Eventually I jokingly let her now she left ME on read and suddenly she dropped the façade. I gave her an inkling of attention and things flowed naturally. She had high interest, but her own self doubt portrayed something else,
this is an outlier but it does happen. She told me later on she was so intimidated and scared that she didn't want to mess things up so she did something unnatural.
Most women at large are glued to their phones, that is true... but so many guys here forget that
women play the same stupid games that we do! Delaying responses to seem 'cool' and 'busy' intentionally?
Girls do it too. Leaving you on read to get your head spinning?
Girls do it too. Withholding their genuine feelings to not seem needy?
Girls do it too. This is why texting is hot garbage and is best used to get the girl to see you in person without the limitations. Texting provides no infliction or tone and things are constantly misinterpreted. You have to do your best to navigate the situation on a per person basis. If you keep trying to avoid being needy you will manifest being needy indirectly, you won't be genuine and women see through that better then men. If you're being too aloof and that isn't who you are then cut it out.
Ok so why do women lose interest when I ghost them?
Don't ghost. Ghosters are weak immature people who lack confrontation skills. At the very least state your done or incompatible or whatever and then proceed to cut off contact, often times the girls comes running back when you do. They want what they can't have. Suddenly going dark is rude as hell and if the girl is of 'some' degree of value she will think
less of you,
even if she's a plate... Ghosting a girl you're genuinely into is not a good idea.
They move on either because:
-you're ghosting genuinely hurt them
-They found it disrespectful (it is),
-your action says 'you're done'
whether or not that is your intention so they move on.
-you are no longer providing the currency of attention
-they had low interest to being with
-They found someone better
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They want to spite you and play the same game as you