[eob]

You're making the assumption that quitting would burn the bridge but my guess is that might not be so. Bosses of course don't like when they lose an employee but it's also not the end of the world.

My best piece of advice is to decide what you want (not what you believe others want of you) and then explain you've made your decision to your advisor in a way that is final, but also authentic and showing compassion for your understanding of their situation.