Ah IsLame bhai, sticky thread you've started.

Well I think alot of factors are at work here. It largely depends on the social environment one lives in and how average interaction is like on a day-to-day basis.
For example; if we are talking about highly "conservative" places like Gulf Arab nations, then obviously when a man starts talking quite often to woman, it means he's hitting on her, no matter what.
As a young man who has friends of a similar age group and also based upon observation of men in general, I think I can say 99% of males are wankers. They are impatient and want to get to have sex with any female asap.
Some men will develop some type of an expectation. These tend to be sexual-physical in nature. So these are preferences to base of selection. And men will start expanding their connections with as many desirable females as much as possible and start trying to build up a solid relationship. Meaning exchanging tweets/shout outs/texts on a regular basis and meeting up, and expressing interests and trying to get as deeper as possible overtime.
Most of them would be friendly. And from there they will move on to intimacy.
Where I live and the kind of culture/atmosphere/setting/sort of people I am used to. Males from 16-30 years old thoroughly convince themselves that they are in a "luvvy duvvy" relationship with whichever females they are currently with even though all throughout the times they are with their gfs and thinking about them when separate, the main thing their minds are preoccupied about is sex.
When I speak to their gfs, their gfs would be saying one thing and when to the guys, the guys would be saying something else. So I can say that on the part of the female
romance plays a greater role whereas for males
lust instead plays a greater role.
This extends to gfs sometimes getting upset that their guys are "pressuring them", "he's taking it too fast", "doesnt he love me more than my flesh?", "I'm not feeling very comfortable as of yet" etc etc
More often than not, these people will break up and end their relationship at any period of a few months to 2 years usually. And after that they will pretend as though they never once were together and try to ignore each other and "move on". This is the time you as a friend have to console them and put up with their bitching.. sorry.. break-up sob story.
Most males would deal with this by enjoying themselves and try to forget it all off. And then try to find another female to replace once they are through asap.
Having observed how people my age behave. I have decided to carefully select a female I desire. I notice the major flaw in any relationship is the
lack of understanding and
the feeling of romance. What leads to breaking is finding being together unbearable. Its usually after past the initial stages of being in a relationship, unable to work things out together, that the attachment slowly ceases and they get bored/tired with each other eventually leading to a break-up.