self-preservation [self-prez-er-vey-shuhn, self-] n.
1. Protection of oneself from harm or destruction.
2. The instinct for individual preservation; the innate desire to stay alive.
Self-preservation is the first law of nature. There are times its better to step away from things/people to gain perspective then to stay and worsen the situation.
… and for that, I will never feel guilty. no matter how much anyone tries.