So why do guys do this
Most Helpful Guy
They´re too lazy or too cowardly to break up with the girl.
Face it guys can be lazy and rather than braking up with a girl it can be easier and more comfortable to just string her along.
I actually see this quite often, too. I feel like this is not OK though, so you should talk about what each of you sees in the future for this relationship.
If a guy is really into a girl, most of them will want a commitment of some form.
If they´re not able to talk about the future some time into the relationship, quite often they probably don´t want to marry that girl.
I hate when this happens, cause it wastes a lot of valuable time.