Depending on the reason for the unexpected and rather quick break up, I can only say that Gemini's have the ability to change in an instant. They are hard to keep up with, hard to read and in some cases, hard to hold onto. But, in my situation, also a sagitarius, I have been with a Gemini for nearly 13 years. I thnk it took him 5 years to say he loved me, but marriage is an absolute no. He is a number 1, meaning he is a loner. He was hurt very seriously by his first wife and I don't think he'll ever take a chance on that again. Maybe reaching out to him is a way to let him know you do care. He may turn off, otherwise. The worst that can happen is he does not respond. You'll be no worse off than you are now! I vote for an attempt to reach out to him. However, I might add, life with my Gemini is difficult. We have different interests and were I younger, I would be bored. I guess it's always life situations that change each person in a sign. Good luck!