Hi Grasshopper
Well, first of all...
I want to say to you that you should not base your decision as to if you should "go back" to your girlfriend on astrology alone.
You really must follow your heart. Astrology is meant as a guide but free will is everything. I hope that makes sense to you I'm going to list some of the aspects that you have together. Some are good - some are not so good....but that is quite normal in any synastry. All relationships need some challenges or they would be too boring
Ok so here's some things for you to think about......
Your Sun squares her Moon and it's very tight - 0 degrees
This would show that they will definately be some conflicts and arguments.
Your Moon squares her Mercury and again it's tight - 0 degrees
You are probably going to have problems understanding each other on an everyday basis. Your interests will most probably be different and sometimes conflicting - which could result in arguments.
Her Moon conjuncts your Saturn - again pretty tight @ 1 degree
This is a nice aspect. She'll be able to bring some fantasy to you as you may be too serious but you'll give her "grounding" which she'll appreciate. So your difference in character will complement each other. Don't be to strict with her
Your Mercury squares her Mars - again tight @ 1 degree
Again this can cause problems - a lacking in understanding each other and your ideas can be very different - this could lead to arguments.
Your Sun opposes her Jupiter - very tight..0 degrees
This aspect shows that whilst you get on well you first meet, sharing the same ideas and tastes....over the years, your ideas may change and you may not develop in the same way. Which could result in you no longer understanding each other.
Your Moon sextiles her Jupiter - again very tight @ 0 degrees
This is a very nice aspect! It shows that you go very well together and that you can understand and have confidence in each other. It will give you the ability to develop side-by-side in the same way, and will have many joint projects. It's a nice aspect for a happy family, where your children can grow up in a very happy atmosphere.
Your Mars squares her Neptune - again very tight @ 0 degrees
This is a tough aspect. It can indicate, lies, aggression, and even violence You could each try to destroy the other with the "weapons" at their disposal, strength against lying.
Her Sun sextiles your Jupiter - again tight @ 1 degree
As a couple people will really like to be with you. You're very charming, agreeable and you both know how to entertain your friends in a generous and warm way. As a couple, you go very well together and should love each other in a discrete and sincere way.