Seventhsun, are you here talking about a Synastry chart or a Composite chart? if you encounter the problems you describe, it could well be seen in the Synastry chart. Should you show these traits in public but in reality things are actually not as bad as they seem, then it is a composite chart.
A composite chart shows how you and your girlfriend, or partner show yourselves to the outside world or how the others perceive you as a couple. There is a great difference.
You can (and that is what I always do) just look at the two charts separately and you will see which one of the two is the dominating, manipulative or jealous one of the two. Or maybe one of you is jealous, the other dominant. Then try to figure out why your girlfriend(or yourself) do this. Jealousy and being dominant dont come from nowhere. It is a result of your upbringing and relationship with people who were important in your life (could even be your teacher! or your nanny, brother or sister, not always your parents). Then talk about it with your partner. Good communication, explaining what bothers you etc. is what will help overcome these problems.
I can immediately see that your Moons are incompatible. Hers in Pisces, your Moon in Aries. Water and Fire. Stephen Arroyo writes that no matter how compatible the rest of a synastry between two people is, when the Moons are not compatible, then this will always be a source of discomfort , even after years and years of marriage. Moon shows where you emotionally feel at best, safe. She feels safe when out on the town and taking the initiative, going places and taking risks, your Moon likes staying home more. Because it rules your Ascendant it works even stronger in your chart.
Thing is that Pisces Moons are very romantic and with Cancer Sun, very caring as well.
A Sun Pisces is less of a romantic than a Pisces Moon, but more illusive and often not very sure about own identity and what they want to do.
The Aries Moon can be very self centered and egoistic, likes to take the initiative, acts on emotional impulse. Pisces Moon is usually much more balanced but can be at times in an emotional turmoil.
Having the same Ascendants is very nice, but look at the rulers. Where is your Jupiter, where is hers? Which sign and house? That shows how you present yourselves. Your Venusses show what you like. If they are in conflicting elements, then you also get a problem there. One likes this, the other likes that.
Mercuries are most important to look at! How does she relate to you and you to her. How are your Mercuries aspected and how are they aspecting one another? different elements, again, different points of opinion. Mercury in Taurus can be terribly stubborn, one in Gemini much more flexible, one in Scorpio might not want to say everything he or she feels. Look at those as well.
Your Jupiter-Venus and Sun-Moon conjunctions can make a lot good of course.
Hope this helps.
Good luck, Starlink