The speaker is looking back on a lost relationship and taking the blame for it. "Safe place" is a lovely way to describe a person: someone who made life feel steady and protected. But the second line turns that comfort around, because the speaker admits to having pushed him away.
The second stanza is where the pain really shows. The speaker says that when they fail to keep living, or keep trying, the fault is their own, since he was the "reason to try." Without him, that motivation is gone. The wording is a little rough in places, but that fits, since it feels like someone speaking in raw, unpolished honesty rather than carefully shaping their words.
The mood is regretful and heavy, with a quiet sense of despair. There is no anger at him, only self-blame. The short, plain lines make the loss feel simple and unavoidable, as if the speaker has nothing left to say except the truth.