Going to grad school can be very demanding and challenging and so not having the choice but to leave it in order to keep one's sanity implies that it was not really comforting in the first place.
Context: "I was really stressed out and grad school and had no choice but to drop out to keep my sanity. "
Hypothesis: Grad school was so comforting that I had no choice but to drop out to keep my sanity
Based on the context, is the hypothesis true, false, or unknown?