If you are pregnant, contact your doctor before taking anything. Your BF will have to see a doc too if he is experiencing symptoms.
You can treat yours with Monistat 3 day or 7 day, I don't recommend the 1 day treatment. Yes, it could be passed along to your boyfriend.
Yeast infections can be passed from partner to partner...... If your boyfriend is showing signs of a yeast infection he can go to the dr and get either topical gel or an antibiotic.....