For someone who claims to get a lot of girls you seem to still be surprised with their psychology.
They play a lot of games... some of the bullshit they pull is used to lie to themselves and justify their actions...
Let's use your example: "I’m coming over but we are NOT having sex."
They say shit like this so that when they inevitably do have sex (which they subconsciously already know they will), they can convince themselves "I'm not a whore. I told him I didn't wanna have sex, it just sorta happened.. oh, well."
"I just coincidentally wanted to shave my cooch that day."
The other bullshit females pull is because dudes tolerate it and humans (men and women) do whatever they can get away with.
If you let this bother you, you'll just be bitter. It's best to not take women too seriously, you'll drive yourself nuts.
In my experience, the better a guy is with women the more they treat them like children. The biggest ladies men almost look down on women because they understand female nature so well.