Welcome to OCDO.
Slow down, breathe. Also, using paragraphs to do more that separate major concepts might make folks take you more seriously. I don't know anything about you except you have had a girlfriend for 13 years, drive an Infinity, and work late - and that in spite all that you write as if you are some teenager still trying to figure out the difference between putting everything that spills out of your mouth down on paper and setting out a reasoned statement of thoughts. (Yes, that's harsh, but it's what you come across as to this olde phart curmudgeon. Live with it.)
Based on what you have written I'd rather see you and your girlfriend put away your guns until you get some basic instruction in self defense - starting with awareness. Then get some training in gun-handling skills. Eventually you can progress to where you learn how to respond to an attempted car "jacking" (not car "jacket") - most of which has nothing to do with using a handgun. If you want specific recommendations I'll start with the NRA's "Refuse To Be A Victim" and "Personal Protection Outside The Home" classes. Look up the NRA on line and find out where/when those are being offered in your area. No matter how long you have been shooting it never hurts to take the Basic Marksmanship training again - which means it ought to be high on your list of classes to take. After you get the fundamentals down you can start looking at the super-tactical "operator" classes or join a practical shooting group at a range near you.