Most Helpful Guy
Just because you think it is prideful and weak for a guy to call an ex doesn't mean that is a guy's actual motivation. Perhaps he understands that returning to a failed relationship is almost always a mistake, because the problems that led to the breakup will still be there. So, maybe it is smart/wise, not prideful/weak.
The fact that you look at his situation and think you understand and ascribe to guys some unflattering motivations says something about what kind of person you are. You should ponder what impression this makes on others.
Most Helpful Girl
Sometimes guys won't call or text their ex because they know that it's better off to leave it. Maybe their ex hurt them or something and they don't want to be with her, even if they do still have feelings. Sometimes you can still love someone but it's just not enough to sustain a relationship. After all, there was a reason it didn't work in the first place, maybe it's better to leave it and move on when you can then go back and potentially get hurt again.