Geminis emotional experience is rich, but its never careless. Every Gemini is honestly and frankly facing each of their feelings. Small noise will never break them apart. If they can separate them, they will never be able to persevere. A relationship stays at this stage, and breaking up is also a good thing to some extent, isnt it?
Gemini chose to break up, in order to give themselves a new start, but also to draw a perfect end to the past, thats all.