@stoneMason-- You may or may not have gotten it from your partner.
Yeast resides in many parts of the body naturally but does not cause any symptoms if there are enough good bacteria to keep yeast in control. So you may have already had yeast in your throat. If your immune system suddenly weakened, or if you used antibiotics which put the bacterial flora out of balance, the yeast might have multiplied to cause an infection.
The other possibility is that your partner did pass the yeast to you but since your partner has a strong immune system, he or she has not experienced a yeast infection.