I hope this experience has taught you a few things.

1) looks have nothing to do with self esteem. Just because she's attractive doesn't mean she's mentally balanced

2) Just because your words say no (ie I have a gf) what you don't say says more (ie If you're going to continue to talk to me like this we have nothing to say to each other). You continued to lead her on, she'd flirt and you'd say "I have a girlfriend" yet continue to text her, implying "I just need a little more persuasion".

3) In a relationship EVERYONE's feelings must be considered. You talked about how you felt, how your gf might feel, but no consideration was given to how volleyball girl might feel about the relationship. I wanted to add, by thinking of your feelings and desires only, you treated both of these women horribly. I hope you feel ashamed about this. NOT because I want you to feel bad, but because this was wrong, if you feel no shame, you'll do it again.

4) Women do NOT like to be referred to as "chicks". The words "bone" and "bang" are offensive because they have an implication of violence and degradation. To be honest for some reason I thought you were a female and gay so I was particularly stunned to see this vernacular. I admit I am only slightly younger than dirt, but I did raise my children with manners. A good rule of thumb is if you wouldn't like this termonology used in conjunction with your grandmother, mother, sister or daughter DO NOT USE IT particularly in mixed company.

And I forgot

5) We are not animals, just because we have an impluse does not mean we have to act upon it.