Taking care of yourself, being true to yourself, and being honest are never selfish. Those traits are what constitute a good life and ultimately relationships.

How could taking responsibility for where you are in your life and re-communicating this to your girlfriend 'hurt her feelings'? It has nothing to do with her and everything to do with you and where you are in your life. She may be disappointed but that is not your 'stuff'.

You sound like someone who knows where they are in life. Be fully there and be honest about it and only good will come.