My girlfriend said I needed to give signs

Obviously you were not the best thing in the world to that girl,... you thought that you were though.

I don't say that to be mean, but to make a point. A lot of guys that are in the same boat as you, put so much time and energy into doing everything (except possibly pay close enough attention to know when you are losing her) for her, that you don't even really focus on HER. You are too caught up in all the things you do, and how great of a guy you are to actually be in the relationship with her.

I am sure that you are able to tell when there is a guy that does not like you,.. or you get a vibe when another guy would want to fight you or is annoyed by you. That's because you are not all involved with yourself, and you are able to pay attention.

Do the same with your girlfriends. Do nice things for them, but don't get wrapped up in the things you do. Pay attention to her, and be with her,... that is what a relationship is all about. Otherwise you may find yourself constantly posting questions about all kinds of great things that you did for a girl, rather than all the great things that you had in a relationship with the girl.