September starts with the Sun in analytical Virgo and your 8th House of Deep Sharing. The good news is you will be engaged in a process of figuring out how to make a partnership work. You may be dealing with what you think are petty matters, yet the success of an ongoing union or a potential new one may depend upon your patience to address these concerns.
Yes, it can be frustrating to feel criticized or belittled, and this is certainly not your idea of an ideal situation. But facing the small stuff, especially practical matters, can make the difference between getting closer or growing apart. The clearer you are about your needs, the better chance you have to get them met. It's helpful, of course, to express them in a kindly manner. Finding flaws in others and yourself may come all too easily now, so don't let what's missing or wrong obscure all the good qualities that are present in your life.
You could get a little itchy and restless around September 19, when your modern ruling planet, electric Uranus, runs into a stressful square with manipulative Pluto. Speedy Mercury triggers this alignment on September 20, which can have you bursting with innovative ideas or frustrated by being stuck in an unchanging situation.
The Sun makes the same aspects on September 29, which can escalate conflict to an even more intense level if you're conflicted about your needs for freedom and closeness. Getting both is possible, but requires some creativity on your part.