Alex McLean's "safe" is a single sentence, but it carries a lot of hurt. The speaker describes someone they trusted to be a refuge, a person or perhaps a place where they could relax and feel protected. Instead, that same person turned out to be the source of the threat. The poem doesn't say who "you" is, and that gap lets readers fill in their own version: a partner, a friend, a family member, anyone who was meant to offer shelter.
The speaker's feeling seems to be a mix of betrayal and disbelief. The phrase "was supposed to be" suggests a promise that was broken, and "ended up" makes the change sound slow and unexpected, as if the danger crept in where no one was watching. The lowercase title and the plain, flat wording create a quiet, tired mood. There is no shouting here, just a bleak statement of fact. That calm tone can feel even heavier than anger, because it sounds like someone who has had time to understand what happened.