Your awareness is a good sign. Now, you have to address your behaviour, establish firm boundaries and find something to keep you occupied. If you let your behaviour get out of control, it can lead to serious problems, such as a full blown obsession and abuse. I don't think you want that.

This is most likely an insecurity in you, not you girlfriend. Have you considered therapy? It would help to find out why you feel worried and paranoid.

Keep talking.

Sorry, for coming across as harsh. It isn't personal.