Where do you draw the line?

When you're dating what is the threshold of negatives that you put up with in the relationship and how do you decide when to put an end to it? For example: my bf likes to skip important social events to stay home and play video games which leaves me having to explain his absence to all of HIS friends, but he fulfills me in many other ways and he isnt willing to change or budge in that area. How do you decide when enough is enough when it comes to certain relationship issues??