Modern dating is a shitshow. With constant connection through social media and the increasing inter-connectedness, our privacy and alone time has been cut drastically. Most people nowadays, through text, talk as much in the first week as our parents did in the first three months. This ability to constantly keep in touch with someone is a new concept in society and right now we are in the throws of its adaptation.
With unlimited texting standards on most phone plans and countless free messaging apps, it has never been easier to establish and maintain contact with someone. This translates into dating because now it's easy to have sustained contact and conversation with someone before ever meeting them in person.
From this concept comes the practice of "breadcrumbing" or texting a girl, leading her into thinking that you will take her on a date and want to get serious, but never actually taking her on a date and the whole time use daily conversation to build a rapport so eventually you can hit her up late night with the "u up?" text and she will know you well enough in order to feel comfortable hooking up and after you can "ghost" her, which means cutting all contact with someone. Breadcrumbing, also known as "fuckboy activity" is used because women, generically, are very susceptible to believing what a guy is saying and ignoring what he does.
In the instance of breadcrumbing, what is going through a woman's mind this whole time is that this guy seems serious because he talks about how he wants to take her out and although it never happens, in this case, it truly is "the thought that counts." Meanwhile, they text and build a rapport and engage in conversation, leading her to feel comfortable with this guy even though they have never met in person, they talk all the time so he must like her! This culminates when he hits her up late at night and her first thought isn't "Oh I've never seen this guy in person, I don't really know him" but "OMG I can actually see him in person now and that's awesome because I know so much about him!"
So the hookup happens and the sex is probably good because that personality side of attraction is already there, which definitely ups the chances of said female catching feelings and then the guy disappears from her life, having completed his end goal of fucking her. It's at this stage in which the girl is usually quite butthurt about the whole thing because she thought they had a connection when in reality she just ended up reading into the situation too much and trusting his words over his actions, leading her to feel betrayed.
Now some might say "Well it's her fault for being naive," but I think it's more about being aware of the tactics and not letting yourself fall into the trap. While what the guy did is hella fucked up, saying "Hey, that's bad don't do that," will not make people stop doing something. I mean look people still say retarded even though it's now "offensive."
As a woman, the best way to protect yourself against this mindset of "texting means a guy is into me" is you have to force yourself to look at someone's actions and not their words, for that is the most telling of who they are. And if a guy hits you up late night and you're looking for something serious, respond with "why don't we do something during the day" and it'll force his hand on whether he wants to end talking to you or get serious about grabbing drinks.