To me, regardless of what you said in the very beginning about just being friends, this has evolved into dating without saying it's exclusive dating outright to each other. Her giving her number to a guy at the bar in front of you, given all the intimacy between you prior to that was just downright rude of her, imo. It was also rude of her to abandon you at HER social event to go dance with other people while you sat on the sidelines, and then she allowed another man to walk her home when she had invited you to this social event? Very rude and inconsiderate. I understand that you may have insecurity issues, abandonment issues and a binge drinking problem. and it's great you are so aware of each issue, however, imo, she is being very rude, hurtful and inconsiderate towards you. These are not things that you do to someone you care about. These are things you do to someone you do not care about. I would personally dump the relationship and move on to someone else who will truly care for you because in my opinion, she doesn't give a rat's *** about you.