If you worry and stress out about things you have no control over, you'll only suffer twice. It's hard to apply to life, but I'm doing my thing. As mothers we want to protect our daughters from everything. We want to eliminate risks and make sure you're safe.
But it's important, no matter how hard it is for you, to tell him to take a chance. Tell him to seek his happiness no matter where or what it is. You may be screaming inside, but if you always tell her to be safe and you always convince her to take the safer path, she may never follow her dreams out of fear of scaring you.