Should you be a good guy to girls in their mid-twenties?

Quite sad, It seems as though from my experience, being a good guy is not going to get you the relationship you are looking for. She won't care about you as much as you care about her. Even if you tell her that you make her a priority, she will still put you last. The one good thing is that if you do reminisce on the times that you did care about her, you will realize that you were nice to her regardless of what you would get in return. The truth is that you cared and you cared a lot. There are times where you will hold on to hope, but as someone with Obsessive-Compulsive Disorder, holding on to that glipse of hope does not provide overall satisfaction. Don't feed that hope with Psychic Energy because the more energy you place into hope, the harder it becomes to undo.