The speaker is stuck in an unhealthy relationship and keeps promising loyalty anyway. The refrain, "As long as you love me I'm yours," repeats so often that it starts to sound less like a vow and more like a plea, or something the speaker is trying to convince themselves of. The partner seems to take and take: the speaker asks to be used, "eaten up and spat out," and "bled dry," yet still says it's okay.
What's striking is how the speaker blames themselves. They feel guilty "for just loving you" and admit that being perfect is too hard, as if the relationship's pain is their failure. The image of living "like broken glass" suggests both of them are fragile and that getting close means getting cut.
The mood is sad, exhausted and desperate. The simple, repetitive lines give it a chant-like quality, like someone going in circles, hoping that love will be enough to fix things.